IDEX has a million diamonds online, more than any other trading portal, according to independent comparisons by the Diamond World website.
It emerges as "front-runner" and is singled out for its transparency and objectivity.
It also boasts by far the highest number of registered sellers, currently around 2,000.
IDEX outperforms five other portals in these key metrics, in a side-by-side analysis with Get Diamonds, Uni Diamonds, VDB, Polygon and DisaSense.
"Based on experience, number of diamonds listed, registered buyers and sellers, IDEX seems to be the front-runner, as it also provides financing as well as logistics," it says.
IDEX also wins praise as a "global, transparent & objective platform with a unique personal service" from researchers at Diamond World, the India-based B2B publication.
Welcoming the results of the analysis, IDEX COO Tamar Katzav, said: "We are delighted to have been recognized for our transparency and objectivity, as well, obviously for having the largest inventory and more sellers than any other site,"
"We pride ourselves on being the only platform that has real diamond prices. Our diamond index is widely respected throughout the industry as the only true reflection of market price trends.
"And as the only B2B platform with transactional capabilities, we've been able to keep business going in recent weeks, with our registered buyers still able to book and buy goods online."
IDEX, a market leader for 20 years, provides buyers and sellers with a full end-to-end service from purchase, authentication, consolidation of shipments and delivery.
Members using the mobile app can already search for diamonds on the go, upload buyer requests and use the diamond price calculator. And soon they'll also be able to use Guaranteed Diamond Transactions, our fully-automated online trading service for polished diamonds.
It provides a two-way guarantee: It guarantees the availability and authentication of goods for buyers, and it guarantees immediate payment to suppliers.
The IDEX diamond trading platform is available for FREE to all newcomers until August 2020. Join today at www.idexonline.com