Las Vegas shows to test diamond demand as 4Cs debate heats up
Polished prices held steady, rough stayed quiet, and buyers kept leaning into larger stones and long fancy shapes as Las Vegas opened its doors.
The clearest signal heading into Las Vegas is not a breakout rally but restraint: polished prices have stayed steady, the rough market remains quiet and demand is still tilting toward larger stones and elongated fancy shapes. That combination gives retailers a practical playbook at the counter. Hold pricing, lean into bigger center stones, and make the case for ovals, marquise and other stretched silhouettes that read modern without abandoning the weight and presence buyers want.
The shows themselves are now the industry’s most concentrated test of U.S. diamond demand. Luxury opened on Wednesday, May 27, and runs through Monday, June 1, with its first two days by invitation only. JCK 2026 follows from Friday, May 29, through Monday, June 1 at The Venetian Expo in Las Vegas, Nevada. Select JCK sections, including AGTA GemFair, the Gems Pavilion, the Hong Kong Pavilion, JCK Talks and the new Lifestyle Pavilion, opened on Thursday, May 28. Fewer overseas diamond exhibitors are expected on the floor, which makes the domestic buyer response even more important.
Rapaport’s May market comment said polished prices were steady, while the rough market was quiet and sales at De Beers’ May sight were low. That is not the language of collapse, but it does suggest caution at the upstream end of the pipeline. For dealers, the message is to avoid overbuying generic inventory and instead concentrate on pieces that align with the strongest current demand: larger, higher-quality diamonds and shapes that elongate the hand or the neckline with a stronger visual spread.
The shape story matters as much as the price story. A February 2026 Natural Diamond Council report found U.S. consumers continued to favor larger, higher-quality diamonds in 2025, and growth in long fancy shapes continued. In practice, that favors well-cut ovals, emerald cuts, pear shapes and marquise stones with clean proportions and lively facet patterning. Those are the stones that can justify a firmer ask, especially when polished pricing is not showing meaningful weakness.
The other tension in Las Vegas is semantic as much as commercial: who gets to use the 4Cs, and for what. GIA said in 2025 that it would stop using the traditional 4Cs grading system for laboratory-grown diamonds and instead use simplified descriptive terminology, while keeping the 4Cs framework for natural diamonds. The African Diamond Producers Association has pushed further, calling for the 4Cs and carat weight to be reserved exclusively for natural diamonds, with synthetic stones measured in grams or kilograms and labeled accordingly. As the market gathers in Las Vegas, that distinction is becoming part of the sales pitch itself, not just the lab report.
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