Sourcing

De Beers, Diacore Buy Blues From the Cullinan Mine

SourcingNov 30, 2020

De Beers, Diacore Buy Blues From the Cullinan Mine

The two companies paid a little over $40 million for the five diamonds, which range in size from 10 to 26 carats.

20201021_Blue_Diamonds_Cullinan.jpg
The five blue diamonds recovered from the Cullinan Mine over the course of the same week in September are, from left to right, 9.61, 11.42, 17.57, 21.25, and 25.75 carats. (Photo courtesy of Petra Diamonds)

London—De Beers Group and Diacore are partnering to buy the five blue diamonds recovered from South Africa’s Cullinan Mine in the same week earlier this year.

De Beers and the diamond manufacturer are paying $40.36 million, split equally between the two companies, for the collection, which totals 85.62 carats and ranges in size from about 10 to 26 carats.

Two natural color diamond experts, Joseph Namdar of Namdar Inc. and Eden Rachminov, said they cannot comment on the purchase price until the diamonds are polished and graded.

“I can tell you with absolute certainty, however, that the buyers are counting on the diamonds being graded as fancy vivid blue,” Namdar said. “Even if they are all graded intense blue, I don’t believe they (De Beers and Diacore) will cover their investment.”

Rachminov, chairman of the board of the Fancy Color Research Foundation, which collects and analyzes wholesale and retail data on fancy color diamonds, called the purchase of the five blue diamonds a “smart move.”

“Generally speaking, any rare fancy color diamond is considered to be a safe purchase these days as the supply diminishes year after year,” he said.

“We also see that fancy color diamond producing mines are slowly closing, such as the Argyle mine, and other mines’ futures, such as Petra (Cullinan) in South Africa and Dominion (Ekati) in Canada, are not clear.”

The diamonds (which can be seen below in the slideshow, in ascending order of size) are: 9.61, 11.42, 17.57, 21.25, and 25.75 carats.

De Beers and Diacore said in the news release on the purchase of the diamonds they will select
“expert craftsmen” to study and cut the diamonds.


Petra announced it was selling the five blue diamonds via tender about a month ago, immediately after the financially troubled miner handed itself over to lenders in a debt-for-equity restructuring deal.

The diamond miner is also dealing with allegations that security employees and contractors at the Williamson mine in Tanzania beat and shot at artisanal miners who trespassed on the site, killing at least seven of them. Petra owns a 75 percent stake in the mine; the government of Tanzania owns the other 25 percent.

Leigh Day, the same U.K. law firm that sued Gemfields over human rights abuses at its ruby mine in Mozambique, has filed a claim against Petra in the High Court in London on behalf of 35 Tanzanians who
live near the mine and claim they, or their family members, were abused by the mine’s security forces.
Michelle Graffis the editor-in-chief at National Jeweler, directing the publication’s coverage both online and in print.

The Latest

Fabergé egg pendant near gloved hand
CrimeDec 17, 2025
Man Pleads Not Guilty to Swallowing Fabergé Pendant

The special-edition egg pendant ingested in a New Zealand jewelry store was recovered after a six-day wait.

Ashley Zhang Jewelry Snake Necklace, Renato Cipullo Hematite Blaze Necklace, Vanessa Fernandez Studio Curva Wrap Hoops, Hernsdorf Tears of Aphrodite Necklace, Robinson Pelham Tsar Star Earrings, Marla Aaron Nymphenburg Lock, Lof The Valentine Ring
EditorsDec 17, 2025
2025 Jewelry Rewind: The Best Piece of the Week Picks

Associate Editor Natalie Francisco plays favorites with Piece of the Week, selecting a standout piece of jewelry from each month of 2025.

Lucy Hale in Jacquie Aiche’s Love and Desire Campaign
CollectionsDec 17, 2025
Lucy Hale Stars in Jacquie Aiche’s Holiday Campaign

The “Love and Desire” campaign is inspired by the magic that follows when one’s heart leads the way, said the brand.

Recipients Collage 2025 - NJ (1872 x 1050 px) (1872 x 1052 px).png
Brought to you by
Impacting Tomorrow Today

How Jewelers of America’s 20 Under 40 are leading to ensure a brighter future for the jewelry industry.

SSEF logo
GradingDec 17, 2025
SSEF Announces 2025 Scholarship Winners

Two awardees will receive free tuition for an educational course at the Swiss lab, with flights and lodging included.

Weekly QuizDec 11, 2025
This Week’s Quiz
Test your jewelry news knowledge by answering these questions.
Take the Quiz
Pandora Alexander Lacik and Berta de Pablos-Barbier
MajorsDec 16, 2025
Pandora’s New CEO Will Step Up Early

Berta de Pablos-Barbier will replace Alexander Lacik at the start of January, two months earlier than expected.

JAR pendant brooch, fancy intense blue diamond
AuctionsDec 16, 2025
Suzanne Belperron, JAR Shine in Sotheby’s First Auctions at New HQ

Sotheby’s held its first two jewelry sales at the Breuer building last week, and they totaled nearly $44 million.

roseco-catalog.png
Brought to you by
Roseco Releases New Full-Line Catalog

Roseco’s 704-page catalog showcases new lab-grown diamonds, findings, tools & more—available in print or interactive digital editions.

The Jewelry Symposium logo
Events & AwardsDec 16, 2025
TJS Now Accepting Scholarship Applications for 2026

Winners will receive free registration and lodging for its fourth annual event in Detroit.

National Jeweler columnists and PR professionals Duvall O’Steen and Jen Cullen Williams
ColumnistsDec 16, 2025
Beyond Unboxing: Creative Reveals to Drive Reach and Engagement

Here are six ideas for making more engaging content for Instagram Reels and TikTok, courtesy of Duvall O’Steen and Jen Cullen Williams.

Tiffany & Co. logo, Anna Martin, CD Peacock logo
Events & AwardsDec 16, 2025
Diamonds Do Good Names 2026 Award Recipients

The honorees include a notable jewelry brand, an industry veteran, and an independent retailer.

Stock image of gavel
CrimeDec 15, 2025
Men Receive Life Sentences in Home Invasion Murder of Jeweler

Carlos Jose Hernandez and Joshua Zuazo were sentenced to life without the possibility of parole in the 2024 murder of Hussein “Sam” Murray.

Eduard Stefanescu, left, and Sara Yood, right
Policies & IssuesDec 15, 2025
Sara Yood Named Co-Chair of RJC Standards Committee

Yood will serve alongside Eduard Stefanescu, the sustainability manager for C.Hafner, a precious metals refiner in Germany.

MS Rau Aspen rendering
IndependentsDec 15, 2025
M.S. Rau to Open Store in Aspen

The New Orleans jeweler is also hosting pop-up jewelry boutiques in New York City and Dallas.

Tiffany & Co. Paraíba tourmaline jewelry
AuctionsDec 12, 2025
13.54-Carat Paraíba Tourmaline Sets Records at Christie’s

Set in a Tiffany & Co. necklace, it sold for $4.2 million, the highest price and price per carat paid for a Paraíba tourmaline at auction.

David Webb holiday window
MajorsDec 12, 2025
David Webb Reveals Ice-Cold Holiday Window Display

The jeweler’s “Deep Freeze” display showcases its iconic jewelry designs frozen in a vintage icebox.

Oscar Heyman Yellow Green Sphene and Diamond Ring
CollectionsDec 12, 2025
Piece of the Week: Oscar Heyman’s Sphene Ring

Take luxury gifting to new heights this holiday season with the jeweler’s showstopping 12-carat sphene ring.

IGI Design Contest Graphic
Events & AwardsDec 12, 2025
IGI Jewelry Design Contest Now Accepting Submissions

This year's theme is “Unveiling the Depths of the Ocean.”

Jacquie Aiche Alien Heart Eye Inlay Necklace, Cicada Dragonfly Brooch, Harkness After the Rain Earrings
TrendsDec 11, 2025
Pinterest 2026 Trend Report: Brooches, Bold Gold, Cool Blue

In its annual report, Pinterest noted an increase in searches for brooches, heirloom jewelry, and ‘80s luxury.

GIA new colored stone report
GradingDec 11, 2025
GIA to Offer Origin Determination for 3 More Gemstones

Starting Jan. 1, customers can request the service for opal, peridot, and demantoid garnet.

Day’s Jewelers Salem New Hampshire store exterior
IndependentsDec 11, 2025
Look Inside Day’s Jewelers’ Ninth Store

The 111-year-old retailer celebrated the opening of its new location in Salem, New Hampshire, which is its third store in the state.

Americas Gold Chain Catalog Volume 3
MajorsDec 11, 2025
Americas Gold Releases New Gold Chain Catalog

The new catalog features its most popular chains as well as new styles.

F.P. Journe FFC prototype
AuctionsDec 10, 2025
Francis Ford Coppola’s Watch Sells for $10.8M

The filmmaker’s personal F.P. Journe “FFC” prototype was the star of Phillips’ recent record-setting watch auction in New York.

Rolex Miami store
WatchesDec 10, 2025
There’s A New Rolex Boutique in Miami

The new location in the Design District pays homage to Miami’s Art Deco heritage and its connection to the ocean.

Stock image of consumers shopping in the winter
SurveysDec 10, 2025
Consumer Confidence Drops in November

Inflations, tariffs, and politics—including the government shutdown—were among consumers’ top concerns last month.

Silas Smith and his Responsible Design Challenge Winning Pendant
Events & AwardsDec 10, 2025
MJSA Names 2025 Responsible Design Challenge Winner

Silas Smith of Meridian Metalworks won the challenge with his pendant that blends Australian and American landscapes.

Sothebys orangy pink The Desert Rose diamond
AuctionsDec 09, 2025
‘Desert Rose’ Diamond Sells for $8.8M in Abu Dhabi

The sale of the 31.68-carat, sunset-hued stone was part of Sotheby’s first series of events and auctions in Abu Dhabi.

×

This site uses cookies to give you the best online experience. By continuing to use & browse this site, we assume you agree to our Privacy Policy