555-Carat ‘Enigma’ Black Diamond Sells for $4.3M Via Cryptocurrency
The founder of a cryptocurrency company purchased the stone and will rename it the “Hex.com” diamond.

Richard Heart, founder of cryptocurrency company Hex, tweeted Wednesday that he’s the one who purchased the diamond. He said he will rename the stone the “Hex.com” diamond.
Unsurprisingly, he used cryptocurrency to buy it, the auction house confirmed in a tweet of its own.
Sotheby’s offered the diamond in a one-lot sale that ran from Feb. 3-9, selling it without reserve, meaning there was no minimum bid required.
The final hammer price fell at the low end of the auction house’s pre-sale estimated range of £3 million-£5 million ($4.1 million-$6.8 million).
I won the world's largest cut diamond for our #HEXican cultural heritage! It'll be called the https://t.co/mLZsmWqXG0 diamond, it weighs 555.55 carats and has 55 facets. Congratulations to all you #HEXicans with #5555 club https://t.co/mLZsmWqXG0 tattoos. Let's all win together! pic.twitter.com/37mfTGbzMe
— Richard Heart ETH FORK PulseChain.com,PulseX.com!❁ (@RichardHeartWin) February 9, 2022
The hamsa, the palm-shaped symbol that is a sign of protection, inspired its shape. The hamsa is associated with the number five, aligning with the diamond’s 555.55 carats as well as its 55 facets.
In 2004, GIA issued a grading report for The Enigma, stating it was “the largest fancy black, natural color and largest diamond” it had graded to date.
The 2006 Guinness Book of World Records also listed it as the largest cut diamond in the world.
Prior to the Sotheby’s sale, the diamond had neither been seen on the market nor exhibited to the public.
The sale of the black diamond via cryptocurrency follows that of the “10138 The Key” flawless diamond in Hong Kong last year.
The buyer paid $12.3 million for the stone using the digital payment system.
The Latest

The yet-to-be named stone is the 10th diamond weighing more than 1,000 carats to come out of Lucara’s Karowe mine.

The founder of Fords Jewelers, Berman is remembered for his love of connecting with his community.

The watch and jewelry retailer had a strong fiscal year despite what its CEO described as a “complex operating backdrop.”

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

The open-to-the-public luxury jewelry and timepiece show, in its second year, is slated for July 23-26.


Bold color, expressive gem-setting, and sculptural form define the three chapters that make up “Stile Libero.”

The New York-based jewelry brand has expanded overseas, opening a store in London’s Mayfair district.

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

Rising revenue does not automatically mean a healthy business, particularly in the current economic landscape, Smith writes.

These long, fluid drop earrings are sure to catch the eye.

Alberto Perez-Elias is one of four men charged with robbing a Cape Coral, Florida, jewelry store and is the only one still at large.

Initiatives in Art and Culture is hosting its 16th annual Gold and Diamond Conference, with the theme of “Resilience.”

The designer, who once said she’d never sell lab-grown diamonds, debuted two capsule collections designed to be fun and easy to wear.

The diamond miner and marketer is undergoing another round of cost-cutting measures ahead of its sale by Anglo American.

The annual trade-only buying event is slated for Oct. 16-19 in Miami Beach, Florida.

AGTA also has announced the lineup of judges for the colored gemstone cutting and jewelry design contest’s various categories.

Collectibles platform Arena Club’s new Time Boxes could contain a Rolex or Patek Philippe watch.

The “Constellation Plié” collar, our Piece of the Week, features diamonds arranged in a constellation of shining stars.

Shaun Wills joined the company in 2024 and was chief financial officer of the De Beers Brands and Consumer Markets division.

In honor of its 20th anniversary, the jewelry brand has released a limited-edition collection of Swiss-made timepieces.

“Human Being” highlights the similarities and differences between us through five sets of jewelry that celebrate fine craftsmanship.

Richemont will continue to provide operational services for the watch brand for a period while the group prepares to integrate it.

Enoch Platero, founder and designer behind Enoch Michael, is the first Native American jeweler to win the award.

AGS also announced the recipient of its “Women in Leadership” scholarship.

The founder of the billion-dollar jewelry and lifestyle brand will debut as a full-time “Shark” on the upcoming season of the show.

Plus, why retailers should be ready to adjust as the U.S. population may decline this year for the first time since the Great Depression.

René Lalique’s “Woman Dragonfly With Open Wings” pendant, the first piece the museum acquired, was one of the jewels taken.



























