CaratGem Diamonds leans on the giants while the market stays soft
Where Petra caved, Gem Diamonds' Letšeng kept firing high. First-quarter 2026 prices rose about 17% to roughly $1,501 a carat, and a 191.82-carat white recovery led a run of exceptional stones that carried its numbers.
The same market that flattened Petra rewarded a different strategy at Gem Diamonds, and the split is the story. Where Petra's smaller goods dragged, Gem's Letšeng mine in Lesotho — the highest dollar-per-carat kimberlite in the world — kept producing the giant, high-value stones that trade in a market of their own.
The barbell in diamonds is now unmistakable — the top holds and the middle sags — and Gem Diamonds is the cleanest expression of the strong end. The risk is concentration, because a quarter that depends on a few exceptional recoveries also depends on the mine cooperating, and geology keeps its own calendar.
| Figure | |
|---|---|
| Large / Exceptional | +17% / ct |
| Commercial Goods | soft |
IA different strategy, a different result
Average prices in the first quarter of 2026 rose about seventeen percent to roughly $1,501 a carat, against $1,288 in the quarter before, and higher realizations offset a lower volume of stones sold.
The trophies did the work. Gem recovered a 191.82-carat Type IIa white and a 100.71-carat faint-yellow diamond, and a single parcel of ten stones larger than 10.8 carats brought in $7 million; four individual stones cleared a million dollars apiece. One 52.24-carat white sold at $32,908 a carat.
In a downturn that has punished commodity goods, a handful of exceptional rocks can still make a producer's quarter.
IIThe barbell in natural stones
That is the quiet lesson of this diamond cycle. The pain has fallen almost entirely on the melee and the near-commercial sizes, where lab-grown competition and thin sentiment bite hardest; the very top of the natural pyramid — the rare, large, certifiably scarce — has held its footing because nothing manufactured competes with it.
Two African miners reported into the same soft tape and posted opposite results, and the difference was the size of the stones in the bucket.
IIIScarcity you can weigh
It is not a model everyone can copy. Letšeng's economics rest on a geological accident, an orebody that throws off big stones at a rate rivals cannot match, and a producer without that luck cannot simply choose to sell giants.
But it does mark where value is defending itself in natural diamonds, and it is the case the trade will make to a nervous consumer: scarcity you can weigh.
01Method · the desk’s arithmetic+
Gem Diamonds, first quarter of 2026. Large-stone realizations against the commercial market. The +17% is the quarter-on-quarter move in average price per carat, $1,501 against $1,288. The company's first-half average, published 28 July, is $1,395 a carat on 42,624 carats, up 38% from $1,008.
02Corrections1 note
Correction, 24 August 2026: this article as published gave an average price of roughly $1,501 a carat, up about 17%, without saying what period it covered. Those are Gem Diamonds' first-quarter 2026 figures, from the first export sale of the year, 16,727 carats against $1,288 a carat the previous quarter. They were correct for that quarter and remain so, and every stone in this article, including the 52.24-carat white at $32,908 a carat, is a Q1 recovery or sale. The fault is that the piece ran on 29 July, one day after Gem Diamonds published its first-half update, which puts the half-year average at $1,395 a carat on 42,624 carats sold, up 38% from $1,008. Read as a current average, $1,501 overstates the half-year by $106 a carat. The period label has been added here and in the by-the-numbers panel, and the half-year figures are reported separately in this paper's 24 August edition.
Petra's revenue caves as the small-stone squeeze bites
At the small end of the market, Petra's revenue halves.
The trade, filed before the New York open.
Prices, tenders and the one story that moved the industry overnight. Ninety seconds.
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