‘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

Whether they evoked nostalgia, wonder, or laughter, these jewels put a smile on our faces.

Scheduled for April 2027, Basilia will be the first watch and jewelry trade show held in Basel since the collapse of Baselworld in 2020.

Submissions for the milestone 25th annual Gem Awards will be accepted across three categories from now through July 31.

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

The beloved beagle dons his aviator outfit for the new Engineer Master II Snoopy Flying Ace timepiece.


She wore the “Le Cauri Endiamanté” earrings, our Piece of the Week, in the Obamas’ first dual portrait for the Obama Presidential Center.

Couture’s Michelle Orman joins Amanda Gizzi and Michelle Graff for this special post-Market Week episode of My Next Question.

DCA is preparing the next generation of professionals by supporting workforce development, leadership growth, and career advancement.

The lab is seeing emeralds with filler added post-testing enter the market, accompanied by reports that indicate little to no treatment.

The third generation of the Stern family to head Patek Philippe, he navigated the “quartz crisis” and preserved the brand’s independence.

The Texas-based jeweler is gradually rolling out a new experience-forward layout in its stores.

The Super Bowl LX champions were honored with diamond and blue sapphire rings by Jason of Beverly Hills.

Marianna Smirnova previously spent a decade working with the Responsible Minerals Initiative, in addition to other relevant roles.

The New York Knicks took home the Larry O'Brien Trophy crafted by Tiffany & Co.

Associate Editor Natalie Francisco lists the trends she spotted during Jewelry Market Week that will dominate the second half of 2026.

Its app now reflects increased prices for Mozambique ruby, as well as changes to its Burma ruby charts.

The manufacturer has tapped Alicia Arnold, the former director of custom design at Tiny Jewel Box.

The revamped, elevated space will feature a two-story Patek Philippe atelier and a rooftop patio for parties.

The special-edition piece marks the 140th anniversary of the iconic beverage brand.

Here are 13 small charms to inspire your layered looks this summer.

Our Pride Month Piece of the Week, the “Margaux” ring, is part of the wife-and-wife team’s new “Lovestoned” collection.

The group has named the keynote speaker and announced a new pavilion for its next event, which is slated for September.

From lions and hippos to snails and fish, Senior Editor Lenore Fedow wrangles her picks for cutest jewelry critters in Las Vegas.

The big stone will be fashioned into a 20.26-carat diamond in celebration of the retailer’s 100th anniversary this year.

Marie-Laure Cérède will join Chanel as the new director of its jewelry creation studio, starting in October.

At the JCK show, the lab-grown diamond brand teamed up with Jewelers for Children to support Make-A-Wish India.

Ilana McCabe is Signet’s vice president of public relations and brand communications.

























