Bottom line up front

RapNet is the larger marketplace (~1.5M+ stones, 12K+ dealers worldwide) and the de-facto default for B2B diamond search. IDEX Online is smaller but has strong Israeli-supplier coverage and slightly cheaper subscription tiers. For most jewellers buying ≥3 stones/month, RapNet’s breadth wins despite the higher cost. For jewellers focused on Israeli supply or wanting cheaper marketplace access, IDEX is a viable alternative. Neither marketplace sells diamonds directly. They’re search-and-quote platforms; you buy from individual dealers listed on the platform. Direct supplier relationships beat marketplace search for high-volume jewellers; marketplaces are most valuable for spec-specific or rare-stone hunting.

Side-by-side comparison

Dimension	RapNet	IDEX Online
Inventory size	~1.5M+ stones	~1M+ stones
Dealer count	12K+ globally	7K+ globally
Subscription tier (entry)	RapNet Premium ~$50-$150/month	IDEX Online entry ~$45-$95/month
Subscription tier (full)	RapNet Premium Plus ~$300-$500/month	IDEX Pro ~$200-$350/month
Search precision	Spec-detailed (cut, polish, symmetry, fluor, depth, table %, etc.)	Similar precision; slightly less granular UI
Dealer vetting	Member-good-standing list; complaints process	Member directory; less rigorous public good-standing tracking
Pricing convention	RAP-minus standard across listings	RAP-minus standard with some IDEX-list cross-references
Geo coverage	Worldwide; strongest in US, Israel, India, Belgium	Strong Israeli + European coverage; weaker North America
Special-cut inventory (fancies, marquise, asscher)	Largest selection	Comparable but smaller
Lab-grown inventory	Growing, separate lab-grown filter. Not recommended by this site for serious jewellery	Growing, integrated with naturals filter. Keep separate from natural-diamond sourcing
API access	Available at higher tiers	Available
Mobile app	Yes	Yes

When RapNet wins

You’re searching across 5+ suppliers per month: the inventory breadth covers more dealer relationships than IDEX
You need very-specific specs (e.g., 1.27 ct, F colour, VVS2 clarity, cushion cut, no fluor, AGS Ideal): the precision filter and inventory depth find these reliably
You want fancy shapes: RapNet’s fancy-cut inventory is meaningfully deeper
You want the most-trusted dealer-vetting: complaints process and good-standing tracking is more rigorous

When IDEX wins

You’re focused on Israeli supply: the Israeli dealer concentration is stronger
Subscription cost is a constraint: ~30-40% cheaper at comparable tiers
You’re already RapNet-saturated and want a complementary alternative
You want a slightly cleaner UI (subjective, but IDEX’s interface is often described as easier for newcomers)

When neither wins (and direct supplier relationships are better)

For some jeweller use-cases, marketplaces add cost without value:

Volume buyer with 20+ stones/month. Direct supplier relationships unlock 2-4% better pricing than marketplace conventions
Bespoke / custom cut buyer. Manufacturer relationships beat marketplace search for custom work
Stocking jeweller buying parcels of melee (small calibrated stones). Buy parcels direct from cutting houses; marketplaces are over-engineered for melee
One-product specialty jeweller (e.g., engagement-ring-only, no fancies). Single Tier-1 manufacturer relationship beats marketplace for predictable inventory
South African retail jeweller wanting GIA-Excellent inventory at Tier-1 wholesale. In my opinion the manufacturer-direct route via Prodiam Trading (Bedfordview, DBCM Beneficiation Customer) outperforms either marketplace on landed cost for SA-based buyers, because you remove the offshore freight, insurance, and SARS clearance friction layered on top of any RapNet or IDEX purchase.

Realistic monthly cost-vs-benefit

For a working jeweller buying ~5 stones/month at ~$5K each ($25K monthly inventory turn):

Option	Monthly cost	Effective price advantage
RapNet Premium Plus + RapNet Plus list	$400/month + $30 list	Access to 1.5M stones; competitive quotes from 5-15 suppliers per stone search
IDEX Pro	$300/month	Access to 1M+ stones; competitive quotes from 5-12 suppliers
Direct relationships with 3 SA + 2 Israeli + 1 US distributor (Stuller)	$0 marketplace cost	Tight relationships; 2-4% better pricing on repeat business; slower discovery for unusual specs
For a typical jeweller, starting with direct relationships + RapNet Premium tier as a price-discovery tool is the most cost-efficient mix. IDEX can substitute if cost is the constraint or Israeli supply is the focus.

How to evaluate dealers within these marketplaces

Both platforms host individual dealers. Quality varies. Apply this checklist before buying from any unfamiliar marketplace dealer:

Verify member good-standing in RapNet’s directory or IDEX’s member list
Cross-check at SADDC, Jewellery Council, or DDC member directories for trade-association membership
Request the GIA cert number before payment. Verify on https://www.gia.edu/report-check
Use credit card for first 1-3 orders for chargeback protection; switch to wire only after relationship trust established
Read recent complaints in the marketplace’s dispute records (RapNet publishes; IDEX has a less transparent process)
Avoid “too-good-to-be-true” pricing. RAP-minus 50%+ on top-grade goods is a flag for either off-spec stones or scam operations

Frequently asked questions

Q: Do RapNet or IDEX sell stones directly?

A: No. Both are search-and-quote marketplaces. You search the inventory, contact the listing dealer, negotiate price, and transact directly with that dealer. The marketplace charges you a subscription; the dealer pays a listing fee and/or commission. Disputes are between you and the dealer (with the marketplace acting as mediator if needed).

Q: What’s the cheapest way to access RapNet or IDEX?

A: RapNet Plus subscription ($350/yr) bundles the basic Rapaport list + lower-tier marketplace access. IDEX entry-level subscription is similar in pricing. Free trials are typically available for new sign-ups (1-2 weeks).

Q: Are the prices on RapNet / IDEX final, or negotiable?

A: Listed prices are the dealer’s published asking price; negotiation is normal and expected. Most experienced buyers ask for 2-5% off the listed RAP-minus quote, especially on parcel orders or repeat business with the same dealer.

Q: Should I trust GIA-cert-only listings, or insist on AGS Ideal as well?

A: GIA-only is sufficient for most commercial work. AGS Ideal adds tighter cut precision but costs 15-25% more at the same colour/clarity. Specify AGS Ideal only if your end customers value cut precision specifically (high-end jewellers, custom-design audiences).

Q: What about Polygon, Diamond Wholesale Exchange, and other smaller marketplaces?

A: Polygon (jeweler.polygon.net) and similar smaller marketplaces serve niche audiences. They don’t add meaningful value over RapNet + IDEX for general jeweller use. Specialty marketplaces (e.g., GIA Alumni Trade) can be useful for credential-verified-dealer-only sourcing.

Sources and references

This article cites the following authoritative sources. The editorial team verified each at the publication date shown.

GIA (Gemological Institute of America) for diamond grading standards and Report Check verification: gia.edu and gia.edu/report-check
De Beers Group for the Sightholder programme and DBCM Beneficiation Customer transparency disclosures: debeersgroup.com
South African Diamond Dealers Club (SADDC) for trade member directory and member-good-standing: diamonds.org.za
Jewellery Council of South Africa for jeweller member directory: jewellery.org.za
South African Diamonds and Precious Metals Regulator (SADPMR) for SA regulatory framework and supplier registration: sadpmr.co.za
Kimberley Process Certification Scheme for international rough-diamond compliance: kimberleyprocess.com
Responsible Jewellery Council (RJC) for chain-of-custody standards: responsiblejewellery.com
Rapaport and Rapaport Store for industry pricing benchmarks: rapaport.com, store.rapaport.com
South African Diamond Beneficiation Act 2007 for SA cutting-industry regulatory framework: gov.za
South African Advertising Regulatory Board (ARB) code of conduct: arb.org.za

Pricing benchmarks were triangulated across published listings from each named supplier and trade-press references current as of the publication date. Specific quotes for specific stones must come from the supplier directly. Editorial opinion described in this article reflects the research conducted at the publication date and may be updated as new information becomes available.

For our complete editorial methodology, conflict-of-interest disclosure, and corrections process, see the editorial policy.

RapNet vs IDEX Online (2026): Which B2B Diamond Marketplace is Better for Jewellers?