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

Bracelets_1872_1052.jpg
Supplier BulletinJul 02, 2026
Elevating Retail Showcases with Today's Necklace & Bracelet Trends

Sponsored by Rio Grande Jewelry Supply

Oscar Heyman Flag Brooch
TrendsJul 02, 2026
Oscar Heyman’s Flag Brooch Celebrates America

The American jewelry house, founded by Latvian immigrants, has been creating American flag brooches since 1917.

D. Geller & Son store mural
IndependentsJul 02, 2026
D. Geller & Son Partners with KSU Art Students on Store Mural

The artwork celebrates the Atlanta jeweler’s legacy and symbolizes its commitment to supporting local artists and its community.

Brought-To-By-Article-Top-Image.jpg
Brought to you by
Wedding Band Trends 2026: Personalization Takes Center Stage

Colored gemstones, artisan finishes, mixed metals, and meaningful details are shaping demand in bridal jewelry.

Hand taking jewelry out of jewelry box
Events & AwardsJul 02, 2026
Stratus Estate Buyers Offers Jewelers Turnkey Buying Events

Its team can evaluate jewelry and watches, as well as luxury handbags, artwork, and collectibles.

Weekly QuizJul 01, 2026
This Week’s Quiz
Test your jewelry news knowledge by answering these questions.
Take the Quiz
Hand holding a gas pump
SurveysJul 01, 2026
Consumer Confidence Ticks Up in June

Falling oil prices were a factor in the slight month-over-month improvement.

Rio Grande Millgrain Wedding band and Round Diamond Engagement Ring
CollectionsJul 01, 2026
Rio Grande Launches First Finished Bridal Collection

The new offering comprises more than 120 bridal and engagement ring styles with natural and lab-grown diamonds.

DCA-NJ-article-1872x1052-060826.jpg
Brought to you by
Building the Future of Jewelry Retail: DCA Expands Education, Leadership Development, and Workforce Solutions

DCA is preparing the next generation of professionals by supporting workforce development, leadership growth, and career advancement.

Rockefeller Center Rink Rolex Clock
WatchesJul 01, 2026
Rolex Unveils Clock at Rockefeller Center

The clock is part of the celebration for the soon-to-open Rolex headquarters on New York City’s Fifth Avenue.

Kristen Cannon
IndependentsJul 01, 2026
Kristen Cannon of Valobra Master Jewelers Dies at 49

The public relations professional is remembered for her benevolent generosity and unwavering commitment to those around her.

G Shock Pokemon watch in Pokeball
WatchesJun 30, 2026
Pokémon Fans Will Want to Catch This New G-Shock Watch

The new watch commemorates Pokémon’s 30th anniversary.

Saks Fifth Avenue door sign
MajorsJun 30, 2026
Saks Global Emerges From Bankruptcy With New Name

The luxury retailer is now called Exemplar Luxury Group.

Jade Ruzzo Lady Collection Compact Mirror Necklace
CollectionsJun 30, 2026
Jade Ruzzo’s New Collection Embodies the Art of Being a Lady

The “Lady” collection is a new take on old beauty standards with gemstone-adorned hair pins and combs, a compact mirror necklace, and more.

American Gem Society
GradingJun 30, 2026
AGS Opens 2026 Recertification Exam

All active members who earned their credential or designation before Dec. 1, 2025, are required to recertify.

Briony Raymond Carousel Collection Campaign Imagery
CollectionsJun 29, 2026
Briony Raymond’s New Collection Is a ‘Carousel’ of Hard Stones

The new jewelry collection uses a colorful palette of onyx, malachite, tiger’s eye, mother-of-pearl, lapis, turquoise, and coral.

Lee Michaels Fine Jewelry Ridgeland Mississippi exterior
IndependentsJun 29, 2026
Look Inside Lee Michaels’ Revamped Mississippi Flagship

Lee Michaels Fine Jewelry is celebrating 30 years in the Ridgeland, Mississippi community.

Sean Milliner
GradingJun 29, 2026
National Rarities Announces New Gemology Manager

Sean Milliner has joined the company.

GIA London Canary Wharf campus
GradingJun 29, 2026
GIA to Open New London Campus

Classes will begin in August at GIA’s new Canary Wharf location.

Hogback diamond ring
AuctionsJun 26, 2026
‘Hogback’ Diamond Ring Finds a New Home

A ring set with “hogback” diamonds, an early stone cut dating to around the 16th century, sold for more than $20,000 at a U.K. auction.

Kris Averi Rainbow Prism Thorn Ring
CollectionsJun 26, 2026
Strength Is Sharpened Into Beauty in Kris Averi’s ‘Prism Thorn’ Ring

The rainbow version of the ring, our Piece of the Week, features angel-cut, octahedral lab-grown sapphires designed to be worn as armor.

A tray of Rembrandt charms
MajorsJun 26, 2026
Rembrandt Charms Debuts ‘Charms That Give Back’

The new initiative donates a portion of the proceeds from select charms to charitable causes.

Bernard James Knickerbockers Special Edition Aura Band
TrendsJun 26, 2026
Bernard James Celebrates Knicks’ Win with Ring

The Brooklyn-based jeweler created a limited-edition version of its “Aura” eternity band, set with gemstones in the team’s colors.

Brandee Dallow
SourcingJun 25, 2026
ICA Names Brandee Dallow as CEO

Dallow will lead the International Colored Gemstone Association, effective July 6.

SCAD Jewelers Mutual Studio exterior
EditorsJun 25, 2026
Out & About: How Jewelers Mutual, SCAD Are Tackling the Bench Jeweler Shortage

Senior Editor Lenore Fedow headed to Savannah to learn more about the 10-year, $10 million partnership between JM and the art school.

Mejuri Steel Collection Campaign Imagery
CollectionsJun 25, 2026
Mejuri Experiments With Steel

Its new capsule jewelry collection features gold-finished stainless steel pieces designed for a maximalist look without a luxury price tag.

Watches and Wonders 2027
Events & AwardsJun 25, 2026
Watches & Wonders Announces 2027 Dates

The week-long event in Geneva is slated for April 2027.

New Gem Legacy board members Annie Doresca, Mark Smelzer, Sara Yood
SourcingJun 25, 2026
Annie Doresca, Mark Smelzer, Sara Yood Join Gem Legacy Board

The three industry leaders bring financial, communications, and legal expertise to the nonprofit’s board of directors.

×

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