☕ China's Lab Diamonds Are Now an AI Stock Play, JCK Wraps With Ovals Everywhere, and Gold Is Still Making You Sweat. Thursday, June 4

The biggest show in jewelry just closed its doors in Las Vegas, and somehow the hottest diamond story coming out of it has nothing to do with engagement rings. It involves Nvidia.

Bloomberg reported today that Chinese lab-grown diamond producers are surging on stock markets for a reason that has nothing to do with weddings. Their synthetic diamonds are being adopted as heat spreaders in advanced AI chipmaking, since diamond's thermal conductivity is five times that of copper. Nvidia's next-generation GPUs are reportedly going all-in on diamond-based cooling, and clients have already validated Chinese producers' diamonds as effective and begun commercial shipments. Shares of Zhecheng Huifeng Diamond Technology jumped 51% last week. SF Diamond was up 40%. For context: the broader CSI 300 index gained 1%.

The immediate impact on your showcase is minimal. Industrial-grade diamonds and gem-quality stones come from different production runs. But here's the longer play: if AI chip demand pulls capacity from Chinese producers, it could slow the relentless price compression on gem-quality lab-growns you've been watching for two years. It won't reverse prices overnight. It might, however, firm a floor that's been dropping quarter over quarter. Worth watching as you plan inventory.

JCK Las Vegas ran May 29 through June 1 at The Venetian Expo under the theme "In Your Element," and the show floor had one loud, consistent signal: elongated fancy shapes are dominating. Ovals, pears, and marquise cuts led the natural diamond floor because of their visual size advantage. Customers get the look of a bigger stone without stepping up a full carat. Rounds still rule at roughly 62% of sales, but ovals are the close and closing second. Gold clocked in at $4,585 per ounce on opening day, a number that had exhibitors simultaneously thrilled and quietly sweating.

If you're not already leading with ovals and pears in your bridal cases, you're behind the curve. These cuts photograph beautifully for social and give you the "bigger stone" conversation with budget-conscious couples without requiring them to jump to a lab-grown. JCK also debuted its new Lifestyle Pavilion this year: a dedicated space for accessories, home decor, and unique gifts. The industry is nudging independents toward diversification beyond core jewelry. Whether that's your play depends on your clientele, but the signal is worth noting.

At JCK's Red Carpet Revue, Le Vian CEO Eddie LeVian unveiled the brand's annual trend forecast, this year framed as "where meaning, memory, and style converge." The five themes for 2027: Patriotism and Americana (Montana Sapphire in denim-inspired gradients, Southwest motifs), Exclusivity (platinum and 18K with Paraiba tourmaline, pieces from $20K to over $1M), Indulgence (the 25th anniversary of Chocolate Diamonds), Serenity (blue-green opals and sapphires in airy nature-inspired designs), and a bold color play theme rounding out the five. Le Vian's forecasts tend to shape what major chains buy, which means these aesthetics filter down to consumer expectations within 12 to 18 months.

The Chocolate Diamond anniversary is your most actionable hook right now. Le Vian will push this hard all year. If you carry Chocolate Diamonds or comparable brown diamond pieces, you have a ready-made marketing storyline: lean into the 25-year milestone in your cases, on your social, and in your email. "A quarter century of something delicious" is a line that writes itself. On the Americana angle: red, white, and blue gemstones have a built-in promotional window every summer. Montana Sapphire is having a moment, and if you're not stocking it, your competitors at shows like this are.

After peaking above $5,100 per ounce in January 2026 and sliding back to around $4,585 at JCK's opening, gold remains at historic highs with no clear return to "normal" in sight. First quarter data tells the real story: measured by weight, gold jewelry sales fell 23% year over year. Measured by value, total spending on gold jewelry rose 16%, hitting $13 billion for Q1. Translation: customers are still buying gold jewelry, they're just buying fewer pieces at higher prices per piece. Unit volume is down; dollars are up.

The adaptation playbook is getting standardized across the industry. Designers are producing lighter-weight gold pieces to hold retail price points. One company, Graziella Air, now makes gold jewelry up to 50% lighter than traditional construction, allowing retailers to offer accessible price points despite record gold costs. If you haven't had this conversation with your gold vendors, have it now. Your customers want gold. They just don't want the sticker shock that comes with a piece designed for a $1,800 per ounce world.

De Beers cut its 2026 production guidance to 21 to 26 million carats, down from a prior range of 26 to 29 million carats, citing ongoing market uncertainty. That's not a small cut. Global natural diamond supply hit multi-decade lows in 2025 (just over 100 million carats, the lowest since 1992), and 2026 is forecast to only modestly recover to around 105 million carats. Analysts estimate De Beers is operating at up to 35% under capacity: a deliberate supply management decision, not a pure production limitation. The goal is clear: defend natural diamond prices by restricting supply at the source.

For indie stores, this has real implications for your natural diamond inventory conversations over the next 12 months. Supply constraints at the top of the chain filter down. Don't expect dramatic price spikes, but the price floor on naturals should firm. If you've been sitting on the fence about stocking up on natural melee or fancy-shape inventory, the supply picture supports acting sooner rather than later. The days of assuming natural diamond prices will keep drifting lower are probably behind us.

With all the noise around lab-grown, it's easy to forget that JCK's natural diamond section was genuinely busy and optimistic. The bifurcation narrative is settling into something workable: natural diamonds are luxury rarities, lab-growns are accessible aspiration, and customers increasingly know which lane they're shopping. The "is it even real?" anxiety is fading. The conversation has shifted to "what does the price gap let me upgrade?" And fancy elongated shapes are winning that conversation, because a 2-carat oval natural reads as bigger than a 2-carat round.

This is the positioning moment independent jewelers have been building toward. You can hold both narratives simultaneously: natural diamonds with provenance and rarity on one side, lab-growns with size and ethics appeal on the other. You're the expert who helps the couple figure out which story is theirs. The big box chains and online retailers can't deliver that conversation with the same credibility. Your product mix is your pitch. Own it.

Today, the industry gave you a lot to process: Chinese lab diamonds pivoting to AI hardware, fancy shapes taking over the bridal floor, and gold prices reminding you that 2026 is not a year to set your strategy and forget it. The stores winning right now are the ones reading the signals and adjusting. You're already doing that. That's why you're here.

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— Karat Clark, Carats & Coffee