Natural Diamond's Last Stand: The Bifurcation Thesis and the Luanda Accord

Every player in the natural diamond industry has been waiting for bifurcation. The theory, held by De Beers executives since at least 2018, is that the market will divide cleanly. Lab grown becomes affordable everyday jewelry. Natural diamonds reassert themselves as rare, emotionally distinct luxury goods that command a premium no factory can replicate.

In its simplest form, lab grown diamonds are chemically identical to natural diamonds and will be priced accordingly, eventually at near-zero margin above production cost. Natural diamonds are geologically scarce and will command a premium from buyers who value origin, rarity, and the permanence that a stone formed over three billion years represents. If bifurcation happens, the natural market shrinks in volume but survives at higher average transaction values. If it does not, and consumers keep migrating to lab grown at every price point, the natural industry faces structural decline with no clear floor.

BriteCo's November 2025 Lab-Grown vs. Natural Diamond Report states that lab grown diamonds are becoming an accessible everyday luxury while natural diamonds reposition as exclusive symbols of enduring value. BriteCo also notes a partial comeback in natural diamond engagement ring sales in Q1 and Q2 2025, following a low of 52.6% market share by value at the end of 2024, recovering toward 57.3%.

The RapNet Diamond Index data for early 2026, reported by CaratX's analysis of Rapaport trade data, shows a market bifurcating internally as well as externally. Smaller natural diamonds are losing to lab grown substitution. Larger natural diamonds, specifically 3 carats and above, are holding and in some cases gaining.

This is exactly the internal bifurcation the industry has predicted: lab grown captures the mass market, natural retains the premium segment. Russell Mehta, Managing Director of Rosy Blue, told National Jeweler in March 2026 that demand for larger goods above 2 to 3 carats is fairly stable and prices have begun to firm up. He noted that the mid-tier segment, diamonds sized from 20 points to approximately 2 carats, remains stressed and difficult, and is unlikely to see significant improvement in 2026.

Signet Jewelers, the world's largest diamond jewelry retailer, reported a 381% surge in net income for fiscal year 2026 to $294.4 million, with average unit retail increasing approximately 7%, per CaratX's market analysis. This confirms the premiumization trend: fewer transactions, higher value per transaction.

In June 2025, diamond producing countries and key industry organizations signed the Luanda Accord in Angola. The agreement commits participants to fund a global generic marketing campaign for natural diamonds through the Natural Diamond Council, the industry's marketing body. Per National Jeweler's March 2026 reporting, the campaign is gaining momentum with government mining ministries and midstream organizations pledging resources, targeting a global campaign in place for the 2026 holiday season.

One senior industry export official described it as the start of a new phase and the emergence of a new coalition of forces within the diamond pipeline. The Luanda Accord is the most coordinated collective marketing response the natural diamond industry has mounted since De Beers' original "A Diamond is Forever" campaign.

De Beers spent decades building the cultural association between diamonds and romance. The Luanda Accord is attempting to rebuild a version of that association specifically for natural diamonds, against a backdrop of lab grown options that are chemically identical and significantly cheaper. The original campaign succeeded because there was no alternative. Natural and lab grown are now direct competitors in the same stores, on the same websites, and in the same purchase decisions. Marketing can sustain a premium for provenance, but only if buyers believe provenance matters.

The challenge is that the buyers most susceptible to marketing are precisely those the natural industry most needs: younger, aspirationally minded consumers currently choosing lab grown at high rates. BriteCo's data shows Millennials and Gen Z driving lab grown adoption. Reversing that preference faces the fundamental obstacle that the cheaper, identical product is already in their hands.

Global natural diamond production in 2025 was estimated at approximately 100 million carats, the lowest annual volume since 1992, per industry estimates reported by CaratX via Rapaport. This is not an accident. De Beers cut its 2025 production target from 30 to 33 million carats down to 20 to 23 million carats, a reduction of more than a third, and set 2026 guidance at 21 to 26 million carats, per De Beers' 2025 preliminary results. Other major miners have made similar adjustments.

Production cuts are the natural industry's most powerful lever. Lab grown supply has no practical upper limit: if demand increases, manufacturers simply run more reactors. Natural supply is constrained by geology, mining capacity, and deliberate output decisions. If demand for large premium natural stones holds while supply is restricted, prices in that segment should rise. The supply discipline is working in the large stone segment, as the RapNet index data shows. It is not working in the small and mid-tier segment, where lab grown substitution has outpaced the supply reduction's ability to support prices.

The natural versus lab grown decision in 2026 is genuinely a values question, not a quality question. Lab grown diamonds are not inferior stones. They carry the same IGI certification, the same color and clarity grades, and the same physical properties as natural diamonds. The difference is origin, and origin carries meaning that is real even if it is culturally constructed.

For buyers who prioritize stone size, grade, certification, and price transparency within a given budget, lab grown offers more purchasing power than any previous generation of buyers has had. The 74% wholesale price decline documented by Edahn Golan Diamond Research has made exceptional stones accessible at price points that did not exist in this category before 2020.

All prices USD. Draco prices converted from CAD at 1 CAD = 0.73 USD. The bifurcation thesis is the natural industry's most plausible path forward, and the early 2026 data shows the beginning of structural bifurcation. None of this reverses what happened between 2020 and 2025: lab grown captured over 45% of US engagement ring purchases and the average lab center stone more than doubled in size while prices fell. The natural industry is not recovering to its former position. It is repositioning to a smaller, more premium one. To compare certified options and see the price before you commit, browse women's rings or build a ring with the ring builder.