Rare 26-Carat Diamond Sells for $1.3 Million at London Auction

At Elmwood's Fine Jewellery auction in London on March 17, a rare white diamond of more than 26 carats sold for £1 million, roughly $1.3 million, drawing competitive bids from telephone and internet bidders before landing with a private British buyer who purchased it as a gift for his wife, to much applause in the room.

The stone, graded VVS1 clarity and I color with no fluorescence, carries GIA's triple excellent designation, meaning it earned the highest possible grades for cut, polish, and symmetry. Its round brilliant cut and the complete absence of fluorescence work together to keep the diamond's brilliance and fire consistent under any lighting condition. It was mounted not in an elaborate setting but in a simple platinum solitaire ring, a deliberate choice that kept the stone itself as the sole point of focus.

Joe Kendrick, head of sale at Elmwood's, described the result in unambiguous terms. "This is an extraordinarily rare diamond," he said. "Its combination of size, VVS1 clarity, and triple excellent cut is something you simply do not see in the U.K. market. Stones of this calibre come along perhaps once in a decade, and this solitaire is a spectacular example of what makes white diamonds so prized by collectors worldwide." Elmwood's described the diamond as combining "rarity, technical perfection, and the enduring allure of one of nature's most remarkable creations."

The sale price landed squarely at the top of the pre-sale estimate of £800,000 to £1,000,000. The last comparable stone on the U.K. auction market was a 26.27-carat white diamond sold by Sotheby's in 2017 for £656,750, a stone that became known as the Tenner after it emerged that its owner had originally bought it for £10 at a car boot sale. The gap between that result and Monday's £1 million hammer price reflects nearly a decade of compressing supply for large white diamonds on the British secondary market, where stones of this magnitude rarely surface outside Geneva or New York.

That scarcity is part of what makes the Elmwood's result notable as a business story, not just a gemological one. The Notting Hill auction house, founded in 2017, has built its model around 0% seller fees, a structure designed to pull high-value consignments away from the established international houses. A seven-figure white diamond selling on New Bond Street's home turf, rather than at a major Geneva sale, suggests that model is working.

Two carat weights appear across coverage of the lot, 26.27 and 26.36 carats, and Elmwood's has not publicly clarified which figure appears on the GIA certificate. The distinction matters for the record, though it does not change the stone's market significance: either figure makes it the largest white diamond offered on the U.K. market in more than a decade.