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

He retired last month after 28 years traveling the world to source the very best gemstones for his family’s jewelry business, Oscar Heyman.

The charm necklace features six nautical charms of shells and coral that founder Christina Puchi collected on Florida’s beaches.

The organization elected its youngest vice president as it looks to draw in fresh talent.

The Seymour & Evelyn Holtzman Bench Scholarship from Jewelers of America returns for a second year.

Campbell joins the company as vice president of business development while Liebler is the new vice president of operations.


The medals feature a split-texture design highlighting the Games’ first time being hosted by two cities and the athletes’ journeys.

Sponsored by The INSTORE Jewelry Show 2025

The countdown is on for the JCK Las Vegas Show and JA is pulling out all the stops.

Globally, travel and transportation brands reigned, while in the U.S., alcoholic beverage companies and a lingerie brand took the top spots.

The Brooklyn-based jewelry designer is remembered as a true artist and a rare talent.

Production at the mine in Canada’s Northwest Territories topped 1 million carats in Q2, the third consecutive quarter of growth.

A new slate of Learning Workshops will take place in Oklahoma, Mississippi, and Georgia.

The middle class is changing its approach to buying jewelry and affordable luxury goods, the NRF said.

It marks the third consecutive quarter of growth for Cartier, Van Cleef & Arpels, Buccellati, and Vhernier.

The reseller’s market trends report, based on its sales data, also shows exactly how much Rolex prices have jumped since 2010.

Jake Duneier and Danielle Duneier-Goldberg have stepped into the roles of CEO and president, respectively.

The “Impermanence” collection contemplates nature through the Japanese art of Ikebana (flower arranging) and philosophy of wabi-sabi.

The Texas-based jewelry retailer has set up shop in Tennessee and Arizona.

Eric Ford will step into the role, bringing with him decades of experience.

In addition to improved capabilities, the acquisition will allow the jeweler to offer support to other independent jewelers.

The “Celestial Blue” capsule collection campaign features Olympian Kateryna Sadurska.

The seasonal store, located in Mykonos, Greece, offers exclusive events, personal styling, and curated experiences.

The New England jeweler is hosting a bridal event for the month of August.

The trade-only event will host its debut fair in the Emerald City later this month.

Its sessions will focus on inventory strategies, staff performance, retention and acquisition, emerging market trends, and more.

For its 10th anniversary, Miseno designed the “Arco” earrings based on the Arco Felice, an arch conceptualized in A.D. 95 in Miseno, Italy.

The jewelry company is one of several contributing to relief efforts in the region after the recent floods.