Sourcing

20-Carat Blue Diamond Goes for $741K Per Carat

SourcingNov 18, 2019

20-Carat Blue Diamond Goes for $741K Per Carat

A leading diamond company bought the stone, which is described as an “exceptional” Type IIb diamond.

20191008_Cullinan-blue-header.jpg
Miner Petra Diamond sold this 20.08-carat “exceptional” Type IIb diamond for nearly $15 million at a tender held at its offices in Johannesburg earlier this month.

Johannesburg—Petra Diamonds Ltd. found a buyer for the 20.08-carat blue diamond it unearthed in South Africa earlier this fall.

The diamond miner recovered the stone from the Cullinan Mine in September, and sold it via a tender held at its diamond marketing offices in Johannesburg earlier this month for $14.9 million, or about $741,000 per carat.

Cathy Malins, a Petra spokeswoman, said in the 10 years the company has been operating the mine this is the second highest price per carat achieved for a blue diamond, a “testament to its very high quality.” 

The highest was a 29.6-carat blue rough that sold for $25.6 million, or nearly $863,000 per carat. That stone was cut into a 12-carat diamond that sold for $48.5 million in 2015 and was dubbed the “Blue Moon of Josephine.”

Petra said a “leading diamond company” bought the 20.08-carat stone but wishes to remain anonymous.

Petra Chief Executive Richard Duffy said in a press release the result is what the company expected and “confirms the resilience in the value of very high-quality blue diamonds.”

“We look forward to following this exceptional stone’s journey to its polished form.”

Also on Friday, the London-based diamond miner announced it is restructuring in order to better support its operations and speed up implementation of Project 2022, a three-year plan to cut debt.

The mines now report directly to Chief Executive Richard Duffy, and the chief operating officer role has been eliminated.

As a result, current COO Luctor Roode is leaving the company immediately.

Duffy said: “Luctor has been instrumental in leading the operations’ transition to steady state operational performance following a long period of capital investment across our mines and I would like to thank him for his significant contribution to the company over the last eight years.

“He leaves Petra at a time when the Company is delivering solid and consistent production results across the operations and I am certain that he will be successful in his future endeavors. We wish him well.”

Michelle Graffis the editor-in-chief at National Jeweler, directing the publication’s coverage both online and in print.

The Latest

Tom Heap
WatchesMar 24, 2026
Christie’s Names New Senior Specialist, Watches

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

NYPD robbery media
CrimeMar 23, 2026
NYPD Looking for 3 Jewelry Store Robbery Suspects

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

Georgia May Jagger in Tommy Hilfiger campaign
FinancialsMar 23, 2026
Movado’s Q4 Sales Rise As Demand Grows From Younger Shoppers, Women

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

GIA iD100®
Brought to you by
Protect Your Customers and Your Business

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

Marco Bicego Art of Craft Campaign Imagery
TrendsMar 23, 2026
Marco Bicego’s New Campaign Showcases ‘The Art of Craft’

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

Weekly QuizMar 19, 2026
This Week’s Quiz
Test your jewelry news knowledge by answering these questions.
Take the Quiz
Couture Time to Watches logo
Events & AwardsMar 23, 2026
These Watch Brands Are Heading to Couture This Year

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

Macy’s New York City Herald Square flagship
FinancialsMar 20, 2026
Macy’s Turnaround Plans Shows Promise, Boosted by Bloomingdale’s

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

TopImageCrop.jpg
Brought to you by
Is This You? Every Jeweler Has This Problem; We Have the Solution.

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

Jwaneng Diamond
AuctionsMar 20, 2026
Sotheby's, De Beers Unveil ‘Jwaneng 28.88’ Diamond

The flawless, Type IIa stone is estimated to achieve up to $2.8 million at the auction house’s high jewelry sale in April.

Tiffany & Co.’s Three Jean Schlumberger for Tiffany & Co. Archives Brooches
TrendsMar 20, 2026
‘Frankenstein’ Costume Designer Is Bejeweled In Brooches for Oscars Win

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

Women wearing Zales jewelry
FinancialsMar 19, 2026
Signet Jewelers to Close 100 Stores, Shutter James Allen Banner

The jewelry retailer announced changes to its store network and brand portfolio during its fourth-quarter earnings call.

Hand holding shopping bags
SurveysMar 19, 2026
NRF Forecasts 4% Retail Sales Growth in 2026

From a weaker labor market to inflation, NRF Chief Economist Mark Mathews gave insight on what retailers can expect this year.

26.36 carat round brilliant cut white diamond
AuctionsMar 19, 2026
26-Carat Diamond Tops $1M at Auction

The historic stone, which sold at Elmwood’s in London, is the largest white diamond to be offered on the U.K. market in more than a decade.

JCK Rocks Nelly Graphic
Events & AwardsMar 19, 2026
JCK Rocks To Ride With Nelly

Three-time Grammy award-winning artist Nelly is set to perform at the annual event at Tao Beach in Las Vegas on May 31.

Lady Wardington and diamond-clip brooch
AuctionsMar 18, 2026
Collection of the ‘Severely Beautiful’ Lady Wardington Fetches $161K

The model and fashion editor’s gold evening bags were the top lots at the London sale, going for more than $25,000 each.

My Next Question Episode 3 guest Johnny Nelson
PodcastsMar 18, 2026
Episode 3: An Interview With Jewelry Designer Johnny Nelson

Fresh off winning the David Yurman Gem Awards Grant, Nelson discusses the ring that launched his career and his plans for the future.

Stuller The Basics of Jewelry
MajorsMar 18, 2026
Stuller Releases New Edition of Jewelry Education Book

“The Basics of Jewelry” has been updated to include modern topics and visuals.

Mark and Candy Udell on stage at the 2026 Gem Awards
Events & AwardsMar 17, 2026
The Best Moments From the 2026 Gem Awards

Held just before the Oscars, the jewelry industry’s big awards show had its share of standout jewelry, gowns, and acceptance speeches.

Natalie Portman in Tiffany & Co. Jewelry
TrendsMar 17, 2026
Natalie Portman Is Tiffany & Co.’s New Ambassador

The Academy Award-winning actress stars in Tiffany & Co.’s latest commercial, which debuted Sunday night during the Oscars.

Jean-Marc Duplaix
MajorsMar 17, 2026
Kering Establishes Jewelry Division, Appoints CEO

The organizational change follows Kering’s promise of a transformation after declining sales in 2025.

Anne Hathaway and Rose Byrne
EditorsMar 16, 2026
2026 Oscars Jewelry: One Necklace After Another

Natalie Francisco rounds up the top Oscars jewels, including Rose Byrne’s Taffin necklace with a more than 20-carat yellow-brown diamond.

Tag Heuer CEO Béatrice Goasglas
WatchesMar 16, 2026
TAG Heuer Has a New CEO

Béatrice Goasglas has been with TAG Heuer since 2018. She is the first woman to head the 166-year-old, LVMH-owned watch brand.

Ben Bridge Jeweler Honolulu boutique
IndependentsMar 16, 2026
Ben Bridge Debuts New Honolulu Boutique

The store features the first in-store build for the jeweler’s in-house “Bella Ponte” bridal brand.

Bonhams fine jewelry Paris
AuctionsMar 16, 2026
Bonhams Paris To Offer Antique, Signed Jewels

The live fine jewelry auction will take place later this week, showcasing antique pieces, rare gemstones, and signed jewels.

Silvia Furmanovich Horse Mane Earrings, Cece Jewellery Underworld Triptych Necklace, Almasika Invictus Flower Brooch
CollectionsMar 13, 2026
A Trio of Jewels from the 3 Gem Award Nominees for Jewelry Design

Our Pieces of the Week honor the 2026 nominees for the Gem Award for Jewelry Design, Silvia Furmanovich, Cece Fein-Hughes, and Catherine Sarr.

Vera Wang
WatchesMar 13, 2026
Citizen, Vera Wang to Launch Watch Collection

The 24-piece watch collection is set to debut in spring 2027.

Andrea Pooler
SourcingMar 13, 2026
Andrea Pooler Joins Third-Generation Diamond Company as COO

Pooler, who has more than 25 years’ experience in jewelry, is now chief operating officer of Modani Jewels, Soham Diamonds, and SNJ Creations.

×

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