Natural diamond prices have fallen more than half from their post-pandemic peak, while the once-unified diamond market splits into two distinct categories: commodity-level stones under increasing pressure from lab-grown competition, and rarer, larger gems that may hold their own.
According to data from Rapaport Group, the diamond trading platform, a standard one-carat stone averaged $8,007 in September 2021. By September 2026, that figure had fallen to approximately $3,898; a decline of 51% in just five years. The Diamond Standard Index, which tracks investment-grade diamonds, hit its lowest level on record in early August 2026, hovering just above 2,500.
The story is not just about falling prices, but about how smaller, commercial-grade natural diamonds are losing ground rapidly to lab-grown alternatives, while larger, high-quality stones are showing signs of resilience and, in some segments, recovery.
De Beers Group, an Anglo American subsidiary that focuses on the mining, sorting, and grading of diamonds, has reported that demand for natural diamonds above two carats began seeing price increases after the broader correction.
The company noted what it described as "encouraging consumer demand signals" in the first half of 2026 in the core US market, where natural diamond jewelry sales returned to growth. Meanwhile, Rapaport reported that its one-carat index was flat in August after 13 consecutive months of decline, while smaller sizes in the 0.30-carat and 0.50-carat range recorded gains during the month.
At the top end of the market, rarity remains a powerful differentiator. An 8.03-carat pear-shaped blue diamond, described by auction house Elmwood's as the largest of its shape and color ever offered at a British sale, was assigned an estimate of between $2 million and $2.6 million ahead of its London auction this week. For advisors with clients in the ultra-high-net-worth space, that kind of auction activity is a reminder that exceptional stones operate by different rules.
The disruption at the commercial end is structural with lab-grown diamonds that share the same chemical and physical properties as natural stones, having captured the bridal market at a pace that would have seemed implausible five years ago.
According to The Knot 2026 Real Weddings Study, engagement rings with lab-grown center stones made up 61% of all engagement ring sales in 2025, up 239% since 2020.
A nearly colorless lab-grown diamond with very slightly included clarity and an excellent cut can be purchased for around $450 on platforms such as Brilliant Earth. A natural stone with equivalent specifications falls in the range of $2,800 to $3,200. The differential can reach as much as 90% depending on size, cut, and color and has pushed cost-conscious buyers decisively toward synthetic alternatives for mid-market purchases.
Cory Schifter, owner of Casale Jewelers in New York and New Jersey, told CNBC that: "You shouldn't be buying a diamond thinking that there's a financial investment [aspect] to it." He suggested clients redirect surplus funds toward the S&P 500 or silver instead.
The lab-grown market itself is not standing still. Fortune Business Insights projects it will grow to nearly $92 billion by 2034, more than tripling its approximately $29.46 billion value in 2025. China now accounts for more than 60% of global synthetic diamond production, and exports of lab-grown stones through the Shanghai Diamond Exchange rose 65.3% year-on-year in the first half of 2026.
The diamond market's structural shift carries practical implications for wealth managers whose clients hold or are considering gemstone assets. The traditional pitch that natural diamonds retain value and appreciate over time, now requires significant qualification.
Where natural diamonds may still have a role is at the upper end (larger stones, exceptional color, provenance-backed pieces) where scarcity provides insulation from lab-grown competition.
Ndaba Gaolathe, the finance minister of Botswana, which holds a 15% stake in De Beers, told the Financial Times that as the market evolved, lab-grown stones were "primarily being seen as a fashion statement" while natural stones were viewed as an "investment." That framing holds most credibly for the top tier of the market.
De Beers announced in July 2026 that it would halt production at its flagship Venetia mine in South Africa for more than two years to constrain supply. Al Cook, De Beers chief executive, told the Financial Times the company sees a broader cultural shift toward authenticity (away from synthetic and digital substitutes) as a tailwind.
Meanwhile, for those considering diamond investments, the importance of due diligence was highlighted by an allegation by the Securities and Exchange Commission (SEC) that a jewelry company's co-founder sold investors stakes in diamonds he never owned.
Bessemer and Brown Brothers Harriman veteran Robert Ludricks III and private markets specialist Olof Akesson join the ultra-high-net-worth push on the East Coast.
Senate Democrats seek data on data center deductions under the 2025 tax law as proposals to tax artificial intelligence multiply.
Geopolitical shocks and market volatility pushed advisor deal decisions off course, denting third-quarter transaction volume by 19 percent.
Hendershott Wealth Management's Hilary Hendershott on turning a niche for women into an operating strategy, not a marketing pitch.
Iowa's Greenwood Wealth Partners exits D.M. Kelly as UBS and Ameriprise win Merrill Lynch recruits in California and Florida
As AI makes financial information more accessible than ever, Lana Hock explains why human judgment, trust, and empathy remain the qualities clients value most in a financial advisor
Northern Trust’s Ken Lassner shows advisors how to convert volatility into after-tax portfolio gains
