‘The Enigma,’ a 555-Carat Black Diamond, Could Sell for $6M at Auction
The massive natural fancy black diamond will be offered without reserve at Sotheby’s next month.

In February, Sotheby’s will put “The Enigma” up on the block. Weighing 555.55 carats, Sotheby’s said it is the largest faceted diamond of any kind to ever appear at auction.
The Engima is being sold without reserve, meaning there is no minimum bid required to win the stone, though the auction house said it believes the diamond could achieve £3 million-£5 million ($4.1 million-$6.8 million).
Both GIA and Gübelin issued reports for The Engima, identifying it as a natural fancy black diamond.
GIA’s library said natural fancy black diamonds have a Mohs hardness of 10, like other diamonds.
They owe their color to numerous minute dark crystals or clouds of graphite, magnetite, hematite, or native iron, it added, and because they have so many inclusions, black diamonds are difficult to polish.
The Enigma is a free-form faceted stone, both labs stated in their reports. Its shape is inspired by the hamsa, a palm-shaped symbol that is a sign of protection.
The hamsa is associated with the number five, reflected in the diamond’s 555.55 carats as well as its 55 facets.
In 2004, when it issued the grading report, GIA said The Enigma was “the largest fancy black, natural color and largest diamond” it had graded to date, and Gübelin said it was the largest faceted diamond it had examined to date.
The stone was also listed as the largest cut diamond in the world in the 2006 Guinness Book of World Records.
The diamond has never been seen on the market nor has it been exhibited to the public, but now “The Enigma” will take center stage as part of a dedicated online-only auction at Sotheby’s.
Sotheby’s unveiled the diamond Monday. It will be on view at the Dubai International Financial Centre from Jan. 17-20, after which it will travel to Los Angeles from Jan. 24-26 and then London from Feb. 2-9.
The one-lot auction will be open for online bidding from Feb. 3-9.
Sotheby’s will again accept cryptocurrency as payment, following the sale of the “10138 The Key” for a record $12.3 million via cryptocurrency last year in Hong Kong.
The Latest

Jamie Cygielman will take on the role on Aug. 24.

Moore, Polly’s husband, is remembered as a family man with an easygoing spirit and a love for sports and the outdoors.

Duvall O’Steen and Jen Cullen Williams share the best ways to display, present, and explain colored gemstones to younger customers.

Retailers are seeking new ways to attract customers, increase traffic, and create revenue – Estate buying events are a popular solution.

The mid-year conference for jewelry and watch appraisers will take place Sept. 5-6 on Zoom.


Honest Hands Ring Co. Founder Benjamin Bosworth shared his thoughts on jewelry technology and why AI can never replace the human element.

QVC Group President and CEO David Rawlinson is temporarily being replaced by a familiar face, former QVC CEO Mike George.

Colored gemstones, artisan finishes, mixed metals, and meaningful details are shaping demand in bridal jewelry.

The brand also added two one-of-a-kind brown diamond pieces to the “Sanssouci” series of its “Gardens” collection.

Ostbye took home top vendor honors at the Independent Jewelers Organization’s show, held last month in Kentucky.

Sponsored by Stratus Estate Buyers

Cloud, who will officially join Blue Nile on Monday, spent 26 years at Tiffany & Co. and founded jewelry brand Roseate.

Garcia will take over from the company’s current CFO, Anders Boyer, who is retiring at the end of November.

Etsy CEO Kruti Patel Goyal explained why the company is letting go more than 200 employees as its performance improves.

The “Star Gazer” pendant, our Piece of the Week, is Syna’s tribute to curiosity and the discovery of something new.

Museum officials are looking to the public to help cover the “exceptional” costs involved in recovering from the July 5 smash-and-grab.

The overhaul includes enhanced employee safety training and trendy earring styles, including lab-grown diamond studs.

The retailer said it had its biggest Mother’s Day ever, with strong demand for higher-priced jewelry.

“Handwork: Handcrafted Objects that Made America” features historic and contemporary works, including a Diné squash blossom necklace.

The Armenian Jewelers Association’s East Coast chapter has also elected its 2026–2027 board of directors.

Onyx Partners has submitted a second offer to buy the department stores after its first offer fell through last year.

Solomon Brothers Jewelers has partnered with local cocktail bar Roaring Social on a new martini garnished with a tennis necklace.

Benjamin Siegel, son of President and CEO Hank Siegel, started working for the family business this week.

The new space features a modern design that blends Bulgari’s Roman heritage with San Diego’s coastal spirit.

Four men were charged in connection with the break-in and accused of stealing $365,000 in cash, jewelry, and designer goods.

André Branch has more than 25 years of experience with various brands, most recently serving as CEO of Ariana Grande’s cosmetics company.

New York-based atelier Gemlok is best known for creating the innovative “bridge” setting that became popular in the bridal market.


























