These 8 Blue Diamonds Worth $70M+ Will Go Up for Auction
“The De Beers Exceptional Blue Collection” will be sold across Sotheby’s jewelry auctions this year and through spring 2023.

Sotheby’s has announced it will sell a group of eight fancy blue diamonds valued at more than $70 million total across its Magnificent Jewels auctions this year and into the spring.
“The De Beers Exceptional Blue Collection,” sourced and assembled by the diamond company, is appearing at auction for the first time.
The group is comprised of eight blue diamonds of various shapes and weights, ranging in size from a 1.22-carat oval brilliant-cut to an 11.29-carat step-cut diamond, for a total weight of 32.09 carats among them.
Three of the diamonds will be offered this year: the 5.53-carat stone will be a highlight of Sotheby’s Magnificent and Noble Jewels auction in Geneva on Nov. 9, while the 3.24-carat diamond and the 2.08-carat diamond will be offered in New York on Dec. 7.
The full list of the eight diamonds and their estimates are as follows.
--11.29-carat step-cut fancy vivid blue (estimated at $28 million-$50 million)
--5.53-carat cushion brilliant-cut fancy vivid blue (estimated at $11 million-15 million)
--4.13-carat step-cut fancy intense blue (estimated at $2.5 million-$3.5 million)
--3.24-carat cushion brilliant-cut internally flawless fancy vivid blue (estimated at $5 million-$8 million)
--3.10-carat cushion brilliant-cut fancy vivid blue (estimated at $4.5 million-$5 million)
--2.08-carat cushion-cut fancy intense blue (estimated at $1.2 million-$1.5 million)
--1.50-carat round brilliant-cut fancy intense blue (estimated at $750,000-$1 million)
--1.22-carat oval brilliant-cut fancy intense blue (estimated at $600,000-$800,000)
De Beers and Diacore jointly paid $40.36 million for five rough blue diamonds from the Cullinan mine weighing 85.62 carats total in November 2020.
Over almost two years, Diacore cut and polished the five rough stones to create the eight blue diamonds in the collection Sotheby’s is now presenting.
They will be on display in Hong Kong from Oct. 17-19, followed by Singapore from Oct. 20-21, Taipei from Oct.26-27, and Geneva from Nov. 4-8.
“I have remained in awe of ‘The De Beers Exceptional Blue Collection’ since the first moment I set eyes on it,” said Olivier Wagner, head of Sotheby’s Magnificent Jewels Auctions in Geneva.
“The market for colored diamonds and precious gemstones has never been stronger, so we are absolutely thrilled to be offering the first diamond of this superb collection as one of the star highlights of our Magnificent Jewels and Noble Jewels auction next month in Geneva. This important gem will, I am sure, captivate all collectors of exceptional gemstones.”
News of the diamond collection comes less than a week after the record-breaking sale of the “Williamson Pink Star” at Sotheby’s.
The 11.15-carat fancy vivid pink diamond sold for more than $57 million in Hong Kong last Friday. With a per-carat sale price of roughly $5.2 million, it now holds the price-per-carat record for any diamond or gemstone sold at auction.
Sotheby’s also sold the De Beers Blue in April, a 15.10 carat step-cut fancy vivid blue diamond that went for $57.5 million.
The Latest

The introduction of platinum plating will reduce its reliance on silver amid volatile price swings, said Pandora.

It would be the third impairment charge in three years on De Beers Group, which continues to grapple with a “challenging” diamond market.

The Omaha jewelry store’s multi-million-dollar renovation is scheduled to begin in mid-May and take about six months.

Launched in 2023, the program will help the passing of knowledge between generations and alleviate the shortage of bench jewelers.

The “Paradise Amethyst” collection focuses on amethyst, pink tourmaline, garnet, and 18-karat yellow gold beads.


The retailer credited its Roberto Coin campaign, in part, for boosting its North America sales.

Sherry Smith unpacks independent retailers’ January performance and gives tips for navigating the slow-growth year ahead.

Criminals are using cell jammers to disable alarms, but new technology like JamAlert™ can stop them.

From how to get an invoice paid to getting merchandise returned, JVC’s Sara Yood answers some complex questions.

Amethyst, the birthstone for February, is a gemstone to watch this year with its rich purple hue and affordable price point.

The Italian jewelry company appointed Matteo Cuelli to the newly created role.

The manufacturer said the changes are designed to improve speed, reliability, innovation, and service.

President Trump said he has reached a trade deal with India, which, when made official, will bring relief to the country’s diamond industry.

The designer’s latest collection takes inspiration from her classic designs, reimagining the motifs in new forms.

The watchmaker moved its U.S. headquarters to a space it said fosters creativity and forward-thinking solutions in Jersey City, New Jersey.

The company also announced a new partnership with GemGuide and the pending launch of an education-focused membership program.

IGI is buying the colored gemstone grading laboratory through IGI USA, and AGL will continue to operate as its own brand.

The Texas jeweler said its team is “incredibly resilient” and thanked its community for showing support.

From cool-toned metal to ring stacks, Associate Editor Natalie Francisco highlights the jewelry trends she spotted at the Grammy Awards.

The medals feature a split-texture design highlighting the fact that the 2026 Olympics are taking place in two different cities.

From tech platforms to candy companies, here’s how some of the highest-ranking brands earned their spot on the list.

The “Khol” ring, our Piece of the Week, transforms the traditional Indian Khol drum into playful jewelry through hand-carved lapis.

The catalog includes more than 100 styles of stock, pre-printed, and custom tags and labels, as well as bar code technology products.

The chocolatier is bringing back its chocolate-inspired locket, offering sets of two to celebrate “perfect pairs.”

Any gemstones on Stuller.com that were sourced by an AGTA vendor member will now bear the association’s logo.

The Swiss watchmaker has brought its latest immersive boutique to Atlanta, a city it described as “an epicenter of music and storytelling.”

The new addition will feature finished jewelry created using “consciously sourced” gemstones.





























