JCK 2026 spotlights the split between natural and lab-grown diamonds

Las Vegas will give the diamond trade a live read on two markets that no longer move in lockstep. When JCK opens May 29 at The Venetian Expo, Clyde Duneier will be watching more than traffic at the booths. He sees the show as one of the rare places where majors, independents, suppliers and brands all speak face-to-face, making it a real-time temperature check on confidence, assortments and demand.

JCK is built for that kind of reading. The show calls itself the world’s largest and most trusted jewelry industry trade event, and says it unites all major segments of the business. Its 2026 floor plan sharpens the divide Duneier wants to track: separate Lab Grown and Natural Diamonds neighborhoods. JCK says the lab-grown area is designed to help key players gain and grow market share, while the natural-diamond neighborhood is a sourcing hub for retailers, designers, manufacturers, wholesalers, dealers and brands looking for shapes, cuts and quality from around the world. Some related events will open earlier, adding another layer of trading and networking before the main floor gets going.

The split matters because lab-grown diamonds are no longer a side story. National Jeweler reported that lab-grown center stones accounted for 61 percent of all engagement ring purchases in 2025, a 239 percent jump since 2020. The Knot said 40 percent of couples specifically said it mattered that the center stone in their engagement ring be lab grown. Those numbers explain why the trade-show floor now needs two different neighborhoods to tell one market story.

Price, however, is still the fault line. A 2026 Rapaport and JCK report said wholesale lab-grown diamond prices fell 14 percent in the first quarter of 2026. Larger stones were hit harder: 3-carat round lab-grown diamonds were down 28 percent, while 1-carat rounds fell 15 percent. That kind of slide changes the conversation from aspirational branding to inventory discipline, especially for buyers trying to decide how much lab-grown product to carry and how aggressively to price it against natural goods.

Las Vegas will also carry the other pressures shaping the mood of the trade. Safety planning and off-floor security warnings from the Jewelers’ Security Alliance will hover over the show, a reminder that JCK is not just a merchandising event but a business and security check-in for the entire sector. The most useful signals will come from the contrasts: which executives sound confident, which cases are getting fuller or leaner, and whether buyers leave talking about value, provenance and margins with the same conviction.