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

Moses, who will leave the lab in May after nearly 50 years, discusses his start in the business, gemstones that stand out, and what’s next.

The new catalog, which showcases 35 one-of-a-kind pieces of jewelry, is a compliment to the company’s popular holiday catalog.

Production has ceased at the Canadian diamond mine, which has yielded more than 150 million carats of rough diamonds in its 23-year run.

You deserve to know what you are selling–to protect your customers as well as your business and your reputation.

The store opening marks the 10th United States location for the India-based jewelry retailer.


Two Saks Fifth Avenue locations, one in Florida and one in California, and one Neiman Marcus store are off the chopping block.

West, who started in the art department at the Leading Jewelers Guild in 1979, is remembered for his patience, kindness, and dedication.

Every jeweler faces the same challenge: helping customers protect what they love. Here’s the solution designed for today’s jewelry business.

In the “Tesoro” version of the ring, our Piece of the Week, each side of the gold hexagonal nugget has a unique colored gemstone design.

Cohen discusses the evolution of Citizen’s light-powered technology, the brand’s cross-generational appeal, and tariffs.

“Essentially Human: On Sales and Salespeople" reveals the underlying human traits and behaviors of the most successful sales professionals.

The collection features symbols of love, luck, and light, based on the story of Queen Cassandane and Cyrus the Great of Persia.

It’s the third scholarship to be launched as part of the partnership to help appraisers advance their professional credentials.

The deadline for entries in the jewelry design competition has been extended to April 3.

After 28 years with JCK, the veteran industry journalist is launching his own publication on Substack called The Jewelry Wire.

Wiley said the project will give scientists worldwide access to the American Museum of Natural’s History renowned mineral collection.

The “Flower Puff” collection looks to beaded flower friendship bracelets from childhood, turning the silhouette into nostalgic fine jewelry.

Set for April 2, the webinar will discuss how the jewelry industry can address the workforce gap.

Bayer, founder of Lisa Bayer Designs, is remembered as “a bright light in every room.”

The next three editions of AGTA GemFair Tucson will feature a five-day show that includes Sunday.

Former Sotheby’s executive Tom Heap has taken on the London-based role.

The group of women allegedly robbed two Catbird stores and one Gorjana location on the afternoon of March 9.

Movado CEO Efraim Grinberg noted continued strength in the fashion watch and accessible luxury segments in the U.S.

After celebrating 25 years in 2025, the campaign marks a new chapter for the jewelry brand with the message that “Identity Creates Value.”

Couture and Time to Watches announced the watch brands, from big names to independents, attendees will see at the show.

Plus, why Saks Global’s bankruptcy may have given Bloomingdale’s an edge.

Costume designer Kate Hawley wore three archival Tiffany & Co. brooches, our Pieces of the Week, while accepting her first Oscar.























