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.”

The Latest

Gretchen Koback Pursel
MajorsSep 08, 2026
Former Tiffany & Co. Exec Joins Exemplar Luxury Group

Gretchen Koback Pursel is the new chief people officer at the company formerly known as Saks Global.

Frederick (Ricky) Wilkinson Bromberg
IndependentsSep 08, 2026
Ricky Bromberg, Longtime President of Bromberg & Co., Dies at 67

Bromberg is remembered as a Southern gentleman who always wore a suit and tie and treated others with kindness.

Zahn Z Zaha rainbow sapphire ring
TrendsSep 08, 2026
Amanda’s Style File: A Hot Take on September’s Birthstone

With high durability and a wide range of colors to choose from, sapphires may be the ultimate birthstone, Gizzi claims.

Cover.jpg
Brought to you by
Your Piece Could Be the One Editors Talk About

Submit your pieces for a chance to win in this year's competition.

The Retail Smiths principal and National Jeweler columnist Peter Smith
ColumnistsSep 08, 2026
Peter Smith: Humor Is No Laughing Matter

Laughter is often considered a distraction in the workplace, but it has benefits for both staff and management, Peter Smith writes.

Weekly QuizSep 03, 2026
This Week’s Quiz
Test your jewelry news knowledge by answering these questions.
Take the Quiz
Rendering of renovated Orloff Jewelers store
IndependentsSep 04, 2026
Orloff Jewelers Will Soon Unveil a Bigger, Better Location

The California jeweler is renovating its store in Fresno, with plans to show off the new space in December.

Chelsea Gabrielle Momentum Infinite Ring
CollectionsSep 04, 2026
Chelsea Gabrielle Transforms Pilates Reformer Springs Into Ring

A lifelong practitioner of Pilates, Gabrielle looked to the springs’ tension and suspension when creating this ring, our Piece of the Week.

1872-x-1052-July-ad (1).png
Brought to you by
Why More Jewelry Retailers Are Hosting Turnkey Estate Buying Events

Retailers are seeking new ways to attract customers, increase traffic, and create revenue – Estate buying events are a popular solution.

JCK Industry Fund logo
Events & AwardsSep 04, 2026
JCK Industry Fund Accepting 2027 Applications

The deadline to apply is Nov. 13.

Remi Guillemin
AuctionsSep 04, 2026
Christie's Names New Global Head of Watches

The auction house has promoted Remi Guillemin, formerly its head of watches for the Americas and EMEA, to the role.

Simon G CEO Zaven Ghanimian
EditorsSep 03, 2026
Q&A: Simon G.’s CEO on Why He Won’t Use AI for Jewelry Design

Zaven Ghanimian discussed the value of human craftsmanship and where the implementation of artificial intelligence does work.

Jewelers of America logo
Events & AwardsSep 03, 2026
Here Are the First Recipients of Nina Pugliese Memorial Scholarship

Jewelers of America also revealed the recipients of the Seymour & Evelyn Holtzman Bench Scholarship and its own scholarship programs.

Robert Pattinson Jaeger-LeCoultre
WatchesSep 03, 2026
Robert Pattinson Joins Jaeger-LeCoultre as Brand Ambassador

The British actor, known for his roles in “Twilight” and “The Odyssey,” will star in a campaign for the Master Control Chronometre.

Sydney Evan Little Love Open Coin Fixed Necklace
CollectionsSep 03, 2026
Sydney Evan Celebrates 25 Years With 4 New Collections

The “Confetti Disco,” “Champagne Cheers,” “Tuxedo,” and “Classic Punk” jewelry collections each capture a distinct spirit of celebration.

Stock image of a gavel
CrimeSep 02, 2026
CA Jeweler Gets 5 Years in ‘Phantom Rolex’ Ponzi Scheme

Nelson Holdo of Newport Beach pleaded guilty to multiple counts of felony grand theft and writing bad checks and was sentenced Monday.

Sandy Lerner’s 18-karat gold and diamond cat brooch
AuctionsSep 02, 2026
If You Love Cats, This Jewelry Auction Is for You

Cat ladies of the jewelry world, unite. Sandy Lerner’s “significant” collection of cat jewelry and other objects is going up for auction.

Arnaud Michon
MajorsSep 02, 2026
Messika Names Former Omega Exec as New President, CEO of Americas

Arnaud Michon, the former Omega USA President, will now lead Messika’s Americas region during its international development.

Glitter in the Grove Logo
Events & AwardsSep 02, 2026
Emerald’s New Owner Introduces ‘Glitter in the Grove’

The branding references the back-to-back jewelry shows that new parent company Forge will host in Miami's Coconut Grove this November.

Stainless steel Patek Philippe Calatrava watch
AuctionsSep 01, 2026
UK Woman Uncovers Rare Patek Philippe Watch in Mom’s Jewelry Box

The stainless steel Patek Philippe “Calatrava” watch from the 1930s sold for nearly $80,000 at a recent Hansons Cornwall auction.

Smart Age Solutions founder and CEO Emmanuel Raheb
ColumnistsSep 01, 2026
Your Jewelry Marketing Has a Bridal Problem

Engagement rings are important but don’t ignore the customers who are buying jewelry “just because,” Emmanuel Raheb writes.

Charlotte Fournet and Krizia Cucurachi
MajorsSep 01, 2026
Kering Names New Pomellato, DoDo CEOs

Former Pomellato CEO Sabina Belli has been named president of Kering Italia amid a shakeup of Kering's new Jewelry division.

Anne Marie Shulman
MajorsSep 01, 2026
Anne Marie Shulman Joins GPA Global

The veteran luxury packaging executive was appointed to help the company grow its North American business.

Photo of one of the suspects in theft of Queen Nazli’s necklace from MAK museum
CrimeAug 31, 2026
$4M Van Cleef & Arpels Diamond Necklace Snatched From Vienna Museum

Once the property of an Egyptian queen, the necklace was part of a larger exhibition of VCA jewelry at the Museum of Applied Arts (MAK).

Ethiopian paraiba tourmaline
GradingAug 31, 2026
GIA, Gübelin Gem Lab Confirm New Paraíba Tourmaline Deposit in Ethiopia

The labs’ separate investigations each determined that the East African country is producing copper-bearing tourmaline.

Levinger & Bissenger silver floral pendant
Events & AwardsAug 31, 2026
Wisconsin Museum to Host Jewelry Exhibition

“Chicago Collects: Jewelry in Perspective” at the Oshkosh Public Museum will feature works by Fabergé, Lalique, and Louis Comfort Tiffany.

Catbird First Men’s Collection Worn Well
CollectionsAug 31, 2026
Catbird Launches First Men’s Jewelry Collection

The “Worn Well” collection is Catbird's take on classic men's jewelry.

Buddha Mama Butterfly Necklace
CollectionsAug 28, 2026
Dolly Parton Would Have Loved This Butterfly Necklace

This Buddha Mama butterfly is our Piece of the Week honoring the legend, who embraced the beautiful insect as her symbol.

×

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