Desenvolvimento de Plataforma de Marketplace de Gemas

Our builds start at $120K for an MVP with parcel-goods inventory, escrow, memo workflow, cert verification, and a commission tier engine. That MVP typically supports 50-100 vendors and handles single-stone and parcel listings out of the box. Scaling to 500+ vendors with advanced search (origin filtering, treatment disclosure, carat-weight facets), mobile apps, and RapNet/IDEX feed sync pushes the build into the $250K-$500K range. For context, founders who try to build this on Sharetribe or CS-Cart typically spend $80K-$150K on customization before hitting a wall on parcel goods and memo, then spend another $120K+ rebuilding from scratch. Our stack -- Next.js, Supabase, Stripe Connect -- is chosen specifically because it scales to thousands of concurrent listings without per-seat licensing fees.

Eighteen weeks from signed contract to production launch with live vendors. Weeks 1-2 are trade workflow audit. Weeks 3-5 are data model and API architecture. Weeks 6-14 are core build with biweekly staging deploys. Weeks 15-17 are vendor onboarding and beta testing with real inventory and escrow transactions. Week 18 is production launch. This timeline assumes you have your first 10-20 vendors identified before we start. If you need vendor recruitment support, add 4-6 weeks of pre-build work. Post-launch, we offer ongoing retainers for feature development, typically $15K-$25K per month.

Yes. At launch, your marketplace verifies certs against 14 lab databases: GIA Report Check, GRS, Gubelin Gem Lab, SSEF, AGL, IGI, AGS, Lotus Gemology, C. Dunaigre, DSEF, GIT, MSU, AIGS, and Bellerophon. When a vendor uploads a cert number, our API checks the issuing lab's database in real time. Verified certs show a green badge on the listing. Certs that fail verification -- wrong report number, expired, or tampered -- are flagged and the listing is held from publication until the vendor resolves the discrepancy. We also cache verification results so repeat lookups do not slow down search.

Your vendors configure memo terms per listing: 7-day, 14-day, or 30-day return windows. When a buyer requests a stone on memo, the platform creates a memo agreement, generates a shipping label, and starts a custody timer. The stone's status changes from 'available' to 'on memo' across the marketplace so no other buyer can request it. During the memo window, the buyer inspects the stone. If they accept, escrow charges their payment method and the vendor is paid after a configurable settlement delay (typically 3-5 business days). If the buyer returns the stone, tracking confirmation resets the listing to available. Overdue memos trigger automated reminders at day 5, day 10, and day 25, plus an admin alert.

The commission tier engine supports unlimited tiers based on any combination of vendor attributes: AGTA membership, GJEPC registration, AWDC affiliation, monthly sales volume, stone category, or custom tags you define. A typical setup might be 8% for new unverified vendors, 5% for verified AGTA members, 3% for vendors doing $100K+/month, and 2% for anchor dealers you recruit at launch. You can also set per-category overrides -- for example, 4% on colored stones but 2% on diamonds. All commission calculations, vendor payouts, and platform revenue are visible in a real-time admin dashboard. Changes to tier rules apply to new transactions only, so existing escrow holds are not affected.

Parcel goods are a native listing type, not a workaround. A vendor creating a parcel listing specifies total carat weight, piece count, calibration range (e.g., 2.5-3.0 mm), shape, origin, treatment status, and price per carat. Buyers can purchase the full parcel or, if the vendor enables it, request a split at a minimum lot threshold (e.g., minimum 50 ct from a 500-ct parcel). The inventory engine recalculates remaining weight, piece count, and per-carat pricing after each split. Mixed lots -- say, 100 ct of heated Mozambique ruby plus 50 ct of unheated Madagascar sapphire -- are supported as multi-item parcels with individual grading metadata per component.

Those platforms are built for generic physical goods. They model inventory as SKUs with quantity counts. A gemstone marketplace needs carat-weight inventory, parcel splitting, memo custody tracking, escrow settlement, and cert verification -- none of which exist in Sharetribe, CS-Cart, or WooCommerce. Founders who start on these platforms typically spend $80K-$150K on custom plugins before discovering that the core data model cannot support parcel goods or memo state transitions. At that point, they are looking at a full rebuild anyway. Our custom Next.js + Supabase build costs $120K for an MVP that handles all of these workflows natively, with no per-seat licensing fees and no plugin dependencies that break on every platform update.

The escrow layer runs on Stripe Connect, which supports 135+ currencies and payment methods including wire transfer (ACH and SEPA), credit card, and bank debit. For high-value transactions common in the gem trade ($10K-$500K per stone), wire transfer is the default with a 0.5% Stripe fee capped at $5. Buyers in GJEPC and AWDC corridors can pay in USD, EUR, CHF, or INR. Vendor payouts are configurable per vendor: daily, weekly, or on a custom schedule. The escrow ledger tracks every hold, release, and refund with timestamps and buyer/vendor IDs, which gives you a clean audit trail for tax reporting and dispute resolution.