You have a jewelry site that needs a live diamond inventory feed. Three names get thrown around — Rapnet, Nivoda, IDEX. Your developer has opinions. Your supplier has a preference. The blogs you can find online are mostly written by the platforms themselves. This post is the version a diamond dealer with a working developer would actually want to read.
I have integrated all three on production sites. Here is how they actually compare on the things that matter when the build is shipping next quarter.
The thirty-second answer
Pick Rapnet if you are an established trade dealer who already has Rapnet membership and your buyers expect Rapnet pricing. Pick Nivoda if you are building a modern B2C or D2C diamond storefront and you want clean per-stone media plus a sane API. Pick IDEX if you have a specific reason — usually a long-standing supplier relationship or a niche you cannot get elsewhere — that overrides the friction of the older API surface.
For most modern jewelry sites being built in 2026, Nivoda is the default. For most established wholesale dealers, Rapnet is the default. The cases where IDEX wins are narrower than the marketing suggests.
What each platform actually is
Rapnet
Rapnet is the original. Founded by Martin Rapaport in 2000, it is the largest diamond trading platform on the planet — somewhere over 1.4 million stones listed on a typical day, ~17,000 member dealers across 95 countries. The Rapaport price list is the de facto industry benchmark for round and fancy-shape diamond pricing. If you are in the trade and somebody quotes you "Rap minus 28", they are quoting against the Rapaport list.
For your website integration, Rapnet exposes the inventory feed (CSV / XML / JSON / SOAP — yes, SOAP is still in their docs) and a search API. Membership has tiers; the upper tiers cost real money and gate access to bulk feeds, search APIs, and the diamond verification service.
Nivoda
Nivoda is the modern entrant — founded 2017, headquartered in London, focused on solving the things Rapnet does not (per-stone HD video, simple per-stone API access, modern auth, fixed-price escrow on lab-grown). They sit between dealer inventory and retail jewelers, taking the verification and logistics middle layer most retailers do not want to operate themselves.
For website integration, Nivoda is straightforward: REST API, OAuth, webhooks for stock changes, a per-stone media bundle that includes video, image, certificate PDF, and certificate JSON (yes, the actual GIA report data, not just the cert number). The API is the kind a senior developer can integrate cleanly in a sprint, not a quarter.
IDEX
IDEX (International Diamond Exchange Online) has been around almost as long as Rapnet — founded 2000, based in Israel, with strong roots in the Israeli and Antwerp trade. The user base is smaller than Rapnet but the prices are often more competitive on certain shapes and sizes.
For integration, IDEX exposes feeds through the standard formats (CSV, XML, JSON) plus an Inventory Marketplace API. The API surface is closer to Rapnet than to Nivoda — older patterns, less modern auth, less predictable rate limiting. Functional, but the integration takes longer than Nivoda.
Inventory size and overlap
Rapnet has the largest inventory. Nivoda has roughly 1 million+ stones depending on filters, with overlap against the Rapnet pool for natural diamonds (many of the same dealers list on both) and a meaningful slice of independent lab-grown supply that does not appear on Rapnet. IDEX sits between the two, with maybe 800,000 stones, with the highest concentration of Israeli-cut natural rounds.
For most sites, the overlap means you do not need all three — pick one as primary, with maybe one as a backup feed for specific shapes or origins. Trying to integrate all three results in deduplication work that absorbs the engineering budget without lifting conversion.
Pricing model and what you actually pay
Rapnet is a tiered annual membership: a basic listing membership starts in the low hundreds USD/year; serious trade memberships with bulk feed access run to several thousand USD/year. The price list itself is a separate subscription. There is no per-stone or per-API-call fee on top.
Nivoda is a transaction-fee model — you do not pay for API access; Nivoda makes money on the markup when a stone sells through your storefront. For retail jewelers this means zero up-front cost to integrate, which is a significant advantage when the catalog is exploratory rather than committed.
IDEX runs an annual subscription similar in shape to Rapnet, with API tiers gated above the basic listing tier. Pricing is on the higher end if you need the API plus the verification service.
What the API actually feels like to integrate
I have shipped at least one of each in production. The honest assessment from the developer side:
Nivoda is the easiest by a wide margin. REST, OAuth, JSON, webhooks. The per-stone payload is dense — pricing, full GIA cert JSON, video URL, images, polish/symmetry/fluorescence/measurements/cut detail. You can build a working diamond search interface in a week if your storefront is already on a modern stack.
Rapnet is fine if you go the "download a CSV daily" route — that is the path 80% of integrations take. The API surface is older and the docs assume you understand SOAP and SOAP-style XML envelopes. For a Next.js storefront this is awkward; you typically end up writing a sync layer that polls the CSV and normalises it into your own database, which is the architecture I recommend regardless of platform anyway.
IDEX is similar in shape to Rapnet but with rougher edges. The same daily CSV pattern works. If you need the realtime API, expect a longer integration than the others.
Media, video, and the per-stone experience
This is where Nivoda pulls ahead for retail-facing sites. The per-stone payload includes a 360-degree video URL on the majority of inventory, plus the certificate PDF and cert JSON. For a site whose conversion depends on the buyer feeling confident in a stone they cannot hold in their hand, this matters.
Rapnet and IDEX both surface video URLs where the supplier has provided them, but the coverage is patchy and the format varies (some are V360, some are Diamoo, some are SARINE viewers). Building a consistent player that handles all three is a real piece of work.
For a wholesale dealer site where the buyer is also a dealer and trusts cert numbers, the video gap matters less. For a retail or D2C site selling to an end consumer, the gap is a meaningful conversion difference.
Lab-grown specifically
Lab-grown is the part of the diamond market that has changed fastest in the last three years. Prices have collapsed on the wholesale side, the cert ecosystem has matured (IGI dominates lab-grown certs the way GIA dominates natural), and supply has flooded the market.
Nivoda has the strongest lab-grown story — the fixed-price marketplace removes the wholesale-price-volatility problem that breaks Rapnet-listed lab-grown pricing on a weekly basis. If you are building a lab-grown-first storefront, Nivoda is the default.
Rapnet has a lab-grown section but the pricing is still chasing the wholesale market in real time, which means your storefront pricing needs to update aggressively to avoid losing money on stones that drop 8% in a week. IDEX has lab-grown but with the smallest selection of the three.
When to integrate two feeds
There are real reasons. The most common: you are a wholesale dealer who has been on Rapnet for ten years and your existing buyers expect Rapnet listings to keep flowing — but you also want a public-facing D2C storefront for retail end-consumers, where Nivoda gives you the per-stone media and clean checkout flow. The architecture is two separate stock pools surfaced through one storefront, deduped by GIA cert number, with origin metadata so the buyer-facing UI does not need to know which feed a stone came from.
The other case: you have specific origin requirements — say, you need Tanzanian-origin natural diamonds at scale — and one platform has stronger supply for that origin than the others. Two-feed integration here is justified, but it is rare.
What this looks like on a modern stack
Whichever feed you pick, the architecture is the same shape: a sync worker that pulls the feed on a schedule (daily for CSV, hourly or webhook-driven for the modern APIs), a normalised stock table in your own database (Postgres works fine; Supabase is the easiest path for most jewelry sites in 2026), and a search layer that indexes that table for the storefront. Algolia or Typesense for the search depending on scale; the storefront itself on Next.js or Astro depending on whether you need real-time inventory updates.
Avoid the pattern of querying the feed API live on every page load — the latency is bad, the rate limits will bite, and you lose the ability to enrich the inventory with your own metadata (your pricing, your descriptions, your filters). The sync-into-your-own-table pattern is universal and does not change with the feed choice.
The honest recommendation
For a new diamond ecommerce site being built in 2026 — D2C, B2C, or hybrid — start with Nivoda. The integration speed, per-stone media, and lab-grown story make it the highest-leverage choice for the build, and the transaction-fee model removes the up-front cost objection.
If you are an established wholesale dealer with existing Rapnet relationships, your customers already expect Rapnet — keep Rapnet as primary, layer Nivoda on top if you want a retail-facing storefront, and skip IDEX unless you have a specific origin or supplier reason.
If you are building for the trade specifically and your buyers are other dealers, Rapnet is still the right default. The richer-media argument for Nivoda matters less when the buyer trusts the cert number.
In all three cases, the question worth more time than the platform choice is the architecture of how you sync, normalise, and present the inventory. That is where the projects succeed or fail. The platform is the easier half.
If this is the project you are scoping
I build diamond and gemstone dealer sites with whichever feed actually fits the trade — usually Nivoda for D2C, Rapnet for wholesale, occasionally IDEX where the supplier requires it. The full brief and pricing is on the gemstone dealer website solution page, including parcel pricing for coloured stones, lab certificate display, and the dealer-portal pattern that gates pricing for trade buyers. Or skip the page and book a 30-min call.