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 jewelry trade show awarded brands and individuals across 14 categories.

Many times, customers walk away without buying because of this one thing salespeople neglect to do, Peter Smith writes.

The donation to a school in Namibia included computer equipment, infrastructure repair and sanitary wear.

The most trusted diamond report, available in print or the GIA App.

More than 250 gem, jewelry, and mineral companies are expected to exhibit, including the American Gem Trade Association.


This year’s Design Atelier is full of gems.

They’re a testament to the power of excellent design.

Navigate origin determination with Continuing Education seminars offered by the GIA Alumni Collective™.

This year’s honorees include one of Florida’s largest independent jewelers and two multi-store independents in the Chicago and New York areas.

The industry’s most influential contemporary designers are showcasing their latest jewelry designs.

Created by Maitri Lab-Grown Diamonds and graded by IGI, it’s slightly bigger than the record-setting lab-grown diamond GIA just examined.

The marketing agency has integrated its first C-suite.

The jewelry trade show also will debut educational content centered around social media.

Luxury kicks off today, with the full show in swing on Friday.

One of the three new collections was inspired by the legend of a woman who traded her mansion to Cartier for two strands of natural pearls.

Rob Ballew will be tasked with communicating the jewelry giant’s plans and financial performance to investors.

With the app, customers receive a 15-day insurance offer on new purchases while their coverage needs are being evaluated.

It is in House of Showfields, a bazaar-style retail space in the borough’s Williamsburg neighborhood.

From consumer trends to retail technology, these are the JCK Talks sessions that should be on attendees’ radar.

They will be celebrated at the annual dinner dance and gala in the fall.

Gemologists have long used machines in diamond grading but technology has made it possible for them to “learn” how to do it on their own.

Supplier Spotlight Sponsored by IGI

Watch retailers Jeffery Bolling and Bobby Bengivengo discuss employee training, customer education and the sticky subject of future value.

The company has plans to revamp the Movado brand and offer less expensive watches this year.

Sponsored by Noam Carver

As cybercrime incidents threaten the industry, jewelers need to know what they’re up against and the best ways to protect their businesses.

The Pittsburgh jeweler is redoing the lighting and showcases, and adding a full hospitality bar as well as new shop-in-shops.