B2B Diamond Trading Marketplace Development
Building a B2B Platform for Diamond Sourcing and Trading
Platform covers customer portal for dealers, admin panel with inventory and bid management, Flutter mobile app, and marketing website with 4C search, certification integration, and KYC compliance. Built on Flutter, React, Node.js, PostgreSQL, AWS with OAuth 2.0 authentication and Firebase real-time auction sync.
Project
Brilliance B2B Diamond Trading Marketplace
Industry
Diamond & Jewelry / B2B Wholesale
Platforms
Web, iOS, Android, Marketing Website
Timeline
6+ months
Core Tech
Flutter, React, Node.js, PostgreSQL, AWS, Firebase
Key Feature
4C search, auctions, GIA/IGI/HRD integration, KYC compliance
Project Overview
A US-based diamond wholesaler partnered with SolGuruz to build a custom B2B diamond trading platform to replace manual workflows like phone-based sales, memo inventory, and trade-show distribution.
The goal was to create a brand-owned digital marketplace, not a generic eCommerce solution or aggregator like RapNet or IDEX Online.
SolGuruz delivered a full-stack B2B diamond platform in 6+ months, including a React.js dealer portal, admin panel with inventory and bid management, Flutter mobile apps (iOS & Android), and a marketing website.
The platform supports dealer onboarding with KYC verification, diamond catalog management with 4C grading (cut, color, clarity, carat), advanced search with certification filters, bid/auction workflows, and secure transaction handling.
Built for real-world diamond commerce, the system handles high-value transactions, certified inventory, and global dealer networks, with compliance coverage for KYC, AML, and Kimberley Process regulations.
What Is a B2B Diamond Trading App?
A B2B diamond trading app (also called a B2B diamond marketplace or online diamond trading platform) is a digital commerce platform that connects diamond wholesalers, dealers, manufacturers, and retailers for business-to-business diamond transactions.
Typical functionality covers inventory management across thousands to millions of certified stones, 4C-grade search (carat, cut, clarity, color) with advanced filtering, bid auctions for competitive pricing, GIA / IGI / HRD certification integration, KYC-compliant dealer onboarding, secure escrow-based transaction processing, insurance-covered shipping, and analytics dashboards. B2B diamond apps reduce the time and friction of traditional diamond trading, which historically relied on physical trade shows in Antwerp and Mumbai, memo-based sales, and phone negotiations.
Unlike generic ecommerce platforms or consumer diamond sites, a custom B2B diamond trading app is built around a specific wholesaler's operator model, their dealer network, their inventory sources, their credit terms, their branding, and their compliance posture instead of forcing their business into RapNet's or IDEX Online's vendor model.
Key Functionality:
Inventory management across thousands to millions of certified stones
4C-grade search (carat, cut, clarity, color) with advanced filtering
Bid auctions for competitive pricing
GIA / IGI / HRD certification integration
KYC-compliant dealer onboarding
Secure escrow-based transaction processing
Insurance-covered shipping
Analytics dashboards
How Does a B2B Diamond Trading App Work?
Dealer Onboarding & KYC Verification
Business credentials, tax ID, bank verification, KYC documents. Admin panel captures full compliance record: identity verification, sanctions screening (OFAC), beneficial ownership declaration, Anti-Money Laundering checks.
Inventory Upload & 4C Grading
Approved dealers upload inventory individually or bulk CSV with full 4C specifications (carat weight, cut grade, clarity grade, color grade), certification details (GIA/IGI/HRD number and lab), fluorescence, polish, symmetry, measurements, and pricing. Platform validates each stone against lab API where available.
Buyer Search & Diamond Discovery
Dealer-buyers search inventory using 4C filters: carat ranges, cut grades (Ideal to Poor), clarity grades (FL to I3), color grades (D to Z), shape, price bands, certification lab, fluorescence. Saved searches trigger alerts when matching inventory is listed.
Bid Auction or Direct Purchase
Buyers either request direct purchase at listed price or join bid auctions with reserve prices, bid increments, outbid notifications, and auction end timers. Winning bid locks stone for transaction settlement.
Transaction Settlement & Certification Transfer
Settled transactions flow through escrow-based payment handling with wire/ACH/SWIFT support for international buyers. Physical stone shipping via insured carriers (FedEx Priority Overnight, Brinks) with Kimberley Process certificate chain of custody maintained for cross-border trade.
Why Did the Client Need a Custom B2B Diamond App?
The wholesaler's growth had outpaced its tools. Operating across a dealer network with thousands of stones in inventory and cross-border buyers, the team had hit three operational walls that off-the-shelf platforms could not solve.
This is a common scaling problem in diamond B2B marketplace operations, where inventory complexity, certification trust, and high-value transactions require deeper workflow control than generic trading platforms provide.
Vendor Lock-in Costs
RapNet and IDEX Online charge per-listing or per-member fees and lock workflows into their vendor model. Scaling meant rewriting internal processes around their platforms instead of the reverse.
Manual Inventory Systems
Inventory ran on spreadsheets and memo books, making real-time updates impossible, bid auctions manual, and certification verification a phone-call process instead of a platform action.
Fragmented Trust Signals
Trust signals-certification display, seller reputation, and transaction escrow-were fragmented across phone calls, emails, and trade shows. This created friction that slowed high-value transactions and pushed dealers back to physical trade shows.
The client wanted software that belonged to them: their branding, workflows, dealer network, and compliance posture built specifically for serious diamond buyers requiring certification depth and transaction security.
Digitize your dealer network with a custom-built marketplace designed for growth, control, and transparency.
Problem & Client Requirements
The biggest challenge in building this B2B diamond marketplace was balancing the needs of three user roles-dealer-buyers, dealer-sellers, and admins-without overloading the interface.
Dealer-Buyers
Needed fast 4C filtering, certification access, and real-time bidding.
Dealer-Sellers
Required streamlined inventory uploads and bid management.
Admins
Needed compliance oversight, transaction monitoring, and analytics.
Compliance Requirements
Compliance was another critical layer. The platform had to support KYC, AML, OFAC screening, Kimberley Process certification, FinCEN reporting, and GDPR requirements directly within the product architecture.
Transaction Security & Trust
Since transactions often ranged from $10,000 to $1M+, the system also required escrow-based payments, insured shipping workflows, certification chain-of-custody tracking, and dispute resolution to build trust across the B2B diamond marketplace ecosystem.
What Solutions Did SolGuruz Deliver?
SolGuruz built a full four-panel custom B2B diamond trading app for the wholesaler with role-specific interfaces, 4C grading integration, bid auction mechanics, and compliance-first architecture. The solution was designed as a scalable diamond application for high-volume dealers, wholesalers, and enterprise trading operations.
Customer Portal (Web)
React-based web portal for dealer-buyers and dealer-sellers with dashboard analytics, 4C-grade diamond search with advanced filtering, diamond list and compare views, diamond details with certificate viewer, saved search with alerts, and bid auction participation. Designed for dense data density common to serious diamond professionals.
Admin Panel (Web)
React-based admin panel for wholesaler operations teams with inventory oversight, KYC / AML compliance review, bid auction orchestration, inquiry handling, client relationship management (KYC, banks, branches, references, settings, credit terms), and business analytics dashboard. Role-based access controls surface the right data to the right team.
Mobile App (iOS + Android)
Flutter-based mobile app for dealer-buyers on the go. Core flows: inventory search with 4C filters, diamond comparison, bid participation, saved search alerts via push notification, and dark mode / light mode support. Designed for dealers traveling between trade shows and offices who need inventory visibility without being at a desk.
Marketing Website
WordPress / Webflow marketing site for dealer acquisition with platform overview, dealer onboarding funnel, and compliance/trust signals. Separate from the authenticated application to maintain security posture.
Tirth Patel
Sr. Business Analyst, SolGuruz | CRM Specialist
"Building a B2B diamond marketplace isn't just about listings, it's about trust. Every decision we made, from 4C filtering to certification integration and KYC workflows, was designed to reduce friction in high-value transactions and give dealers complete confidence in the platform."
Direct insight from the SolGuruz team that built Brilliance
The Role of SolGuruz Team
We at SolGuruz follow a detailed software development process to deliver excellence. Let's dive deep into the process.
Diamond app UX/UI Design
- User research and personas
- Wireframing and prototyping
- Appealing visual design
- Modern aesthetics and mobile friendly design
- Usability testing
Diamond App Development and Launch
SolGuruz Development Process - From Research to Post-Launch
The B2B Diamond app was delivered using SolGuruz 10-stage lifecycle for SaaS marketplace development. Each stage has a fixed duration, a named deliverable, and a defined team-no undefined work, no scope drift. Compliance checkpoints are woven into architecture, QA, and deployment rather than treated as a separate phase.
Discovery & Market Research
Founder interviews with the wholesaler leadership, competitor teardowns across RapNet, IDEX Online, VDB, and Nivoda, and diamond trade compliance mapping (KYC, AML, Kimberley Process, OFAC). Dealer persona research with active diamond buyers and sellers. Deliverables: discovery document, competitive landscape report, compliance matrix, and prioritized feature list.
Requirements & Scope Finalization
User stories and acceptance criteria in Gherkin format for every feature across dealer-buyer, dealer-seller, and admin roles. Data flow diagrams for inventory upload, bid auction lifecycle, KYC verification, and transaction settlement. Scope locked with explicit carve-outs for Phase 2 features (live video stone inspection, AI-powered price recommendation, insurance API integration).
UI/UX Design
Figma-based design system covering customer portal, admin panel, mobile app, and website. Each panel is designed against its user role: dealer-buyers for 4C search speed, dealer-sellers for inventory upload efficiency, and admins for compliance oversight. Dark mode / light mode variants are built into the component library from the design stage.
Architecture & Technical Planning
System design covering role-based access control, certification data pipeline (GIA / IGI / HRD API or certificate image ingestion), bid auction engine with real-time Firebase sync, KYC document storage with encryption, and transaction settlement with audit immutability. Database schema designed for ACID compliance on diamond transactions and 6-year audit retention for compliance.
Mobile App Development
Flutter-based iOS and Android builds. Cross-platform codebase cut build time ~40% vs. native parallel development while maintaining dense table performance for 4C search results. Push notifications for outbid alerts, saved search matches, and bid auction endings. Dark mode / light mode variants implemented with design token parity.
Web Development (Customer Portal + Admin Panel)
React-based builds for both customer and admin interfaces. Component library built for dense inventory tables, real-time bid updates, and multi-dealer navigation. Performance-tested for admin teams managing 10,000+ diamond SKUs without interface degradation. Tailwind CSS is used for consistent design token application.
3rd-Party Integrations
GIA / IGI / HRD certification verification (API or certificate image ingestion), sanctions screening for OFAC compliance, shipping integration (FedEx Priority Overnight, Brinks), and optional insurance integration (Jewelers Mutual, Lloyd's) for in-transit stone coverage. Each integration is built with fallback logic for partner API downtime.
Backend + API Development
Node.js backend handling authentication, role-based permissions, certification data ingestion, bid auction orchestration, KYC document processing, and notification fan-out. PostgreSQL for ACID-compliant transaction integrity. Firebase for real-time bid synchronization across dealer devices. RESTful APIs with Swagger documentation for clear contract-first development.
Quality Assurance & Testing
Functional testing across 15+ device profiles for the mobile app. Security review by an independent auditor against OWASP Top 10. Load testing at 3x projected launch volume to handle high-activity bid auction peaks. End-to-end testing of KYC workflows, inventory upload, bid auction lifecycle, transaction settlement, and cross-border dealer onboarding.
Deployment & Post-Launch Support
Mobile app deployed to Apple App Store and Google Play Store with business-category metadata. Customer portal and admin panel deployed to AWS production with automated backups, database-level firewalls, rollback capability, and monitoring dashboards live before public launch. Soft launch with a subset of the wholesaler's dealer network before full rollout.
Post-Launch Support & Iteration
SolGuruz runs 2-week sprints for post-launch iteration. Monitoring covers inventory upload success rate, bid auction completion rate, KYC processing time, transaction settlement reliability, and real-time crash telemetry. SLA: critical bugs fixed within 24 hours, high-priority bugs within 72 hours. Quarterly reviews track compliance regulation changes (Kimberley Process updates, OFAC list changes, FinCEN thresholds).
Inventory, bids, KYC, and certification unified in one custom B2B diamond marketplace. Share your operator profile and dealer network scope, and we'll map the build.
Tech Stack That Powers Event Hub
Stack decisions were driven by three constraints: cross-platform feature parity for attendees and organizers, real-time engagement at scale during live event sessions, and PCI-DSS compliant payment processing for ticket sales.
Key Features of the Brilliance B2B Diamond App
Let's dive deep into the best features that define our research and skillset as a software development company.
Customer App
Customer Portal Features
Dashboard analytics with buying trends and saved activity, 4C-grade diamond search with carat/cut/clarity/color filters plus shape, fluorescence, polish, symmetry, certification lab, and price band. Diamond list view with sort and filter. Diamond comparison up to 4 stones side-by-side with specification and certificate overlay. Diamond details with certificate viewer, rotating 360 view where available, and dealer info. Saved search with alert notifications. My Bid dashboard shows active bids, outbid alerts, and auction end timers.
Admin Panel Features
Admin dashboard with system performance and business analytics. Inventory management with CSV bulk upload, inventory sync, stock status tracking, and low-inventory alerts. Inquiry management for dealer and salesperson questions. Bid management with auction orchestration, reserve prices, bid increments, buyer invitations, and auction end logic. Carat range configuration. Client management with full KYC workflow business verification, KYC document capture, bank verification, credit terms management, dealer verification level, and reference tracking.
Mobile App Features
Mobile-optimized 4C diamond search with the same filter depth as the web portal. Diamond list view, comparison view up to 4 stones, and full diamond details, including certificate viewer. Live bid participation with push notification alerts for outbid and auction end. Dark mode and light mode for dealer preference and low-light trade show environments.
Admin Panel
Admin Dashboard
Admin dashboard with system performance and business analytics.
Inventory Management
Inventory management with CSV bulk upload, inventory sync, stock status tracking, and low-inventory alerts.
Inquiry Management
Inquiry management for dealer and salesperson questions.
Bid Management
Bid management with auction orchestration, reserve prices, bid increments, buyer invitations, and auction end logic.
Carat Range Configuration
Carat range configuration.
Client Management
Client management with full KYC workflow business verification, KYC document capture, bank verification, credit terms management, dealer verification level, and reference tracking.
4C Grading System Integration
The 4C grading system is the foundational taxonomy of diamond commerce. Every serious B2B buyer shops on certification grades not on marketing imagery. The Brilliance platform integrates the full 4C grading system as the primary search and filter dimension:
Carat Weight
Full carat range search with exact-weight matching and range-based filtering (0.25ct, 0.50ct, 0.75ct, 1ct+, 2ct+, 3ct+, 5ct+, etc.). Admin-configurable carat range bands align with the wholesaler's inventory profile.
Cut Grading
Full cut grade filtering: Excellent, Very Good, Good, Fair, Poor. Ideal cut supported as a separate premium tier. Each stone displays proportions, table %, depth %, and girdle measurements from the certificate.
Clarity Grading
Full clarity scale: FL (Flawless), IF (Internally Flawless), VVS1, VVS2 (Very Very Slightly Included), VS1, VS2 (Very Slightly Included), SI1, SI2 (Slightly Included), I1, I2, I3 (Included). Buyers filter on exact grades or grade ranges.
Color Grading
Full D-Z scale for white diamonds and fancy color grading for fancy yellows, pinks, blues, and browns. Color filter supports individual grades, color groups (colorless D-F, near-colorless G-J, faint K-M, very light N-R, light S-Z), and fancy color categories.
Advanced Filters
Fluorescence (None, Faint, Medium, Strong, Very Strong), Polish (Excellent, Very Good, Good, Fair, Poor), Symmetry (Excellent, Very Good, Good, Fair, Poor), certification lab (GIA, IGI, HRD, EGL, AGS), measurement ratios (length-to-width), shape (Round, Princess, Cushion, Emerald, Oval, Pear, Marquise, Radiant, Asscher, Heart).
GIA / IGI / HRD Certification Integration
Diamond certification is the single most important trust signal in B2B diamond trading. Buyers must verify certification before any significant transaction. The Brilliance platform integrates certification at three levels:
Certificate Number Search & Validation
Every listed stone carries its certificate number (GIA, IGI, HRD, or EGL). Buyers can search or validate any certificate number directly in the app.
Certificate Image Viewer
High-resolution scans of the actual certificate PDF are viewable inside the platform. No email round-trip, no phone-call verification, the certificate is next to the stone.
API Verification (Where Available)
For labs with API access, certificate data is pulled directly from the lab on stone listing - ensuring the specifications match what the lab graded. Mismatches flag the listing for admin review.
Bid Auction Mechanics
Bid auctions are a primary transaction mode in B2B diamond trading especially for premium stones where competitive bidding maximizes seller value. The Brilliance platform implements full auction mechanics:
Reserve Prices
Sellers set minimum acceptable prices. Stones do not sell below reserve even if bidding closes.
Bid Increments
Configurable bid increments by stone value tier $100 increments for stones under $10k, $500 for $10k-$50k, $1,000+ for larger stones.
Outbid Notifications
Real-time push notifications and in-app alerts when a buyer is outbid. Dealers on the mobile app see notifications instantly via Firebase.
Auction End Timers
Configurable auction durations (24-hour, 48-hour, 72-hour). Anti-sniping extension: last-minute bids extend the auction by a configurable window.
Winning Bid Flow
Winning buyer receives a transaction initiation workflow: payment rails, shipping coordination, certification transfer, and insurance confirmation. Losing bidders are notified and returned to search.
Mobile Screens
Here are the screenshots that help you with an exact view of the mobile app screens of our B2B diamond marketplace.
Dark Mode
Light Mode
Tablet Screens
Here are the screenshots that help you with an exact view of the tablet app screens of our B2B diamond marketplace.
Dark Mode
Light Mode
B2B Diamond App Compliance & Regulatory Framework
B2B diamond trading operates inside one of the most heavily regulated commerce categories globally. The Brilliance build was architected against six overlapping regulatory layers, each baked into the platform from Sprint 1:
KYC (Know Your Customer)
Every dealer completes KYC at onboarding: business license verification, tax ID capture, beneficial ownership declaration, and identity document upload. KYC records are stored encrypted with a 6-year retention for audit.
AML (Anti-Money Laundering)
Transaction patterns flagged against AML rules under the Bank Secrecy Act. High-value transactions trigger additional review. Dealer behavior patterns are monitored for suspicious activity.
Kimberley Process Certification Scheme
All diamonds on the platform certify conflict-free status per the Kimberley Process. Certificate chain-of-custody tracked across cross-border shipments. The platform blocks listings without Kimberley Process compliance documentation.
OFAC Sanctions Screening
Dealer and buyer identities are screened against OFAC sanctions lists at onboarding and re-screened quarterly. Sanctioned parties blocked from platform access; flagged matches route to compliance review.
FinCEN Reporting
Cash-equivalent transactions over $10,000 trigger FinCEN reporting requirements. The platform captures the data required for Form 8300 filing and maintains reporting trails.
GDPR (EU Dealer Data)
Dealers based in the EU benefit from GDPR-compliant data handling: consent capture, data portability, right to erasure (where not superseded by AML retention), and breach notification within 72 hours.
SolGuruz Security Credentials
SolGuruz is ISO 27001:2022 and ISO 9001:2015 certified, with security practices audited against both standards every year, which meets or exceeds the security posture expected for B2B marketplaces handling high-value diamond transactions.
Security Practices Implemented
Data Encryption
Data is encrypted in transit and at rest. Transport uses HTTPS with TLS 1.3 certificates. Storage uses full-disk encryption on database instances plus field-level encryption for dealer KYC documents, bank verification records, and payment credentials.
OAuth 2.0 Authentication
OAuth 2.0 governs authentication flows across dealer-buyer, dealer-seller, and admin roles. Scope-based permissions prevent a dealer-buyer token from accessing admin data, and a dealer-seller token from accessing other sellers' inventory.
AWS Firewall Rules
Firewalls are configured on AWS instances and databases with allow-listed services. Inbound access is restricted to essential ports. Admin access requires multi-factor authentication and role-based permissions.
Source Code Obfuscation
Source-code obfuscation is applied to release builds of the mobile app so the distributed binary is difficult to tamper with or reverse-engineer. Sensitive keys are stored in AWS Secrets Manager and never bundled with the app.
Automated Backup and Rollback
Cloud instances take scheduled backups at regular intervals. Rollback to a specific version is automated critical for a platform where a bad deployment cannot be allowed to compromise a live bid auction or transaction settlement.
Project Outcome
Brilliance B2B Diamond launched on schedule and reported measurable operational improvements within the first two quarters post-launch:
• Replaced spreadsheet and memo-book inventory with a real-time platform supporting thousands of certified stones searchable by full 4C grading
• Enabled bid auctions at scale previously impossible without platform infrastructure, unlocking competitive pricing for premium stones
• Reduced dealer onboarding time significantly through digital KYC workflows, replacing paper-based verification
• Improved certification verification speed by integrating GIA / IGI / HRD certificates directly into stone listings
• Passed external security review before launch with encrypted PHI-equivalent handling for dealer KYC data
• Delivered a platform where the wholesaler owns their data, their branding, their dealer network, and their feature roadmap with no per-member subscription ceiling
What Our Client Has To Say
A verified Clutch review from the Manager of a Belgium-based diamond trading company - they prefer to stay anonymous on Clutch, and we’ve preserved that attribution here. The review followed our B2B diamond app development engagement.
Mobile App Development for Diamond Trading Company
SolGuruz has delivered a functional app that has helped the client improve their work processes and increase sales. The team is organized, communicative, and responsive to the client's needs. They respond calmly and professionally, even under pressure, and communicate via virtual meetings.
From the verified Clutch review by
Manager, Diamond Trading Company
Antwerpen, Belgium
Top B2B Diamond Marketplaces: Competitive Analysis
The global B2B diamond marketplace in 2026 is led by four major players. Here is how a custom Brilliance build is positioned:
Platform
Market Position
Core Strength
Gap or Limitation
Market Position
Global Market Leader
Largest B2B diamond marketplace globally, 30,000+ members, owned by Rapaport Group
Core Strength
Inventory Scale & Integration
Largest diamond inventory network; Rapaport Price List integration; strong dealer network across the US, Asia, Europe; established trust signals
Gap or Limitation
Vendor Lock-in & High Fees
Per-member subscription fees; workflows locked to RapNet model; limited customization for individual wholesalers; generic UX
Market Position
Polished Diamond Focus
Second-largest B2B diamond marketplace with 1M+ diamonds listed, strong in polished diamond trading
Core Strength
Pricing Index & Volume
Large inventory volume; real-time pricing; IDEX diamond price index; strong for the polished diamond trade
Gap or Limitation
Workflow Inflexibility
Subscription-based access; workflow inflexibility; customer support reviews are mixed in the dealer community
Market Position
Premium Jeweler Focus
Upscale-focused B2B platform with a strong US jeweler network
Core Strength
Premium UX & Visuals
Premium positioning; strong jeweler-facing UX; 360 video integration for select stones
Gap or Limitation
Limited Scale & Higher Fees
Smaller dealer network than RapNet/IDEX; per-listing fees; less comprehensive inventory for wholesale buyers
Market Position
Lab-Grown Focus
Emerging B2B diamond and lab-grown diamond marketplace, growing rapidly in 2025-2026
Core Strength
Modern Platform & Hybrid Stones
Natural + lab-grown diamonds in one platform; modern UX; streamlined ordering and shipping; competitive pricing
Gap or Limitation
Emerging Player
Smaller inventory than RapNet; newer platform with still-evolving dealer network; not yet a global leader
Frequently Asked Questions
Quick answers to the questions our clients and prospects ask most. If yours is not here, our team is one click away.
Need advice tailored to your project?
FAQs cover the common ground. For decisions specific to your tech stack, timeline, and team, talk directly to a senior engineer who has shipped what you are planning.
Custom-built trading platform with 4C search, GIA integration, and compliance-ready architecture designed for real dealer networks, not templates.
Related Projects
More Projects We Have Delivered
SolGuruz has shipped 102+ products across 14 industries. See other diamond industry platforms our team has built - B2B CRM portals and diamond selling websites that demonstrate our specialized expertise in gem trade software and luxury goods digitization.
B2B Diamond CRM Portal With ERP Synchronisation
Gem is a B2B diamond trading portal with inventory sync to client ERP systems, 4 platforms (web, mobile, backend, cloud), and enterprise security.
Key Outcomes
Diamond Website Development
Explore the journey from concept to success in online diamonds Jewellery selling through our case study on website development.
Key Outcomes