Sourcing

Petra Puts 39-Carat Blue Diamond Up for Sale

SourcingJun 21, 2021

Petra Puts 39-Carat Blue Diamond Up for Sale

The stone, which is similar to the rough diamond that produced the “Blue Moon of Josephine,” is expected to sell for upward of $50 million.

20210617_39 carat blue diamond.jpg
Miner Petra Diamonds recovered this 39.34-carat Type IIb blue diamond from the Cullinan Mine in April. It’s showing the diamond to potential buyers this month, with tender bids closing around July 12.
London—Petra Diamonds Ltd. has released details on the sale process for the nearly-40-carat blue diamond it recovered from the Cullinan mine in April, a remarkable stone expected to sell for upward of $50 million.

Viewings of the 39.34-carat, Type IIb stone will take place throughout June and into early July, including a stop in New York from July 7-9.

Tender bids are scheduled to close on or around Monday, July 12 at 10 a.m. EDT. 

In an interview with National Jeweler last week, George Togholian, a gemologist at L.J. West Diamonds, compared the 39.34-carat diamond to another big chunk of blue rough mined at Cullinan in January 2014—the 29-carat stone that became the $48.5 million “Blue Moon of Josephine.”  

New York-based Cora International cut that stone, and Togholian, who worked as a gemologist and consultant for the company then, helped with the planning process.  

Though he has not seen the 39.34-carat rough diamond in person yet, he said in pictures it looks “very similar” to the rough that produced the Blue Moon, possessing the color and texture specific to blues from Cullinan. 

“This is a special tone of blue. It’s not comparable to any other diamond that comes to auction,” Togholian said. 

“In my opinion, these are the best of the blues. This is on another level.”

While he declined to share his guess as to the diamond’s sale price, Togholian did note the 39-carat rough probably will deliver about a 40 percent yield—the yield for blues and pinks is generally less than yellow or white diamonds because the material is not as smooth, he noted—which means a polished diamond of about 15 to 16 carats. 

 Related stories will be right here … 

That’s 3 to 4 carats larger than the 12.03-carat Blue Moon of Josephine, which still holds the world auction record for highest-grossing gemstone per carat at $4 million.

Joseph Namdar, of Namdar Inc., described the 39.34-carat blue rough as a “very special diamond” that is “thought to be one of the purest blues to ever be mined.” 

While noting bidding is unpredictable, he put the rough diamond’s sale price at $55 million to $65 million.

Petra Diamonds operates three underground diamond mines in South Africa—the Cullinan, Finsch, and Koffiefontein—as well the open-pit Williamson mine in Tanzania. Williamson has been on care and maintenance since April 2020. 

The Cullinan mine has produced a number of famous diamonds, including, of course, the 3,106-carat Cullinan, the rough that produced the 69-carat Taylor-Burton Diamond, and the aforementioned 29-carat blue rough that became the Blue Moon of Josephine

Anyone interested in scheduling a viewing of the 39.34-carat blue diamond should contact Petra’s Group Head of Sales and Marketing Greg Stephenson at diamondsales@petradiamonds.com or +27 836 379 849. 

The Latest

All four models of Citizen’s new Rainell watch
WatchesOct 06, 2025
This Fall, Citizen’s Forecast Calls for Rain

Citizen’s new “Rainell” women’s watch has a raindrop-shaped case and is available with a silver-, gold-, purple-, or green-colored dial.

Mercedes Gleitze Rolex Oyster 1926
AuctionsOct 06, 2025
The ‘Rolex That Made Rolex’ Heads to Auction at Sotheby’s

The “Mercedes Gleitze Rolex Oyster,” named for the British endurance swimmer who made it famous, will go up for sale next month.

Amit Pratihari GIA India
GradingOct 06, 2025
GIA India Names Former De Beers Exec as New Managing Director

Amit Pratihari was previously the managing director of De Beers India and Forevermark India.

ja_fall_2024_by_headshot_stories_6824.jpg
Brought to you by
JA New York Fall Is Right Around the Corner

The upcoming show provides savvy retailers with the opportunity to stock their cases with best sellers in advance of the holiday season.

Selena Gomez and Benny Blanco Wedding, Jacob & Co. Watch
TrendsOct 03, 2025
Selena Gomez, Benny Blanco Tie the Knot Wearing Diamonds, White Metals

Gomez’s jewelry included Tiffany & Co. drop-style earrings while Blanco stacked diamonds from Jacob & Co. on his wrist.

Weekly QuizOct 02, 2025
This Week’s Quiz
Test your jewelry news knowledge by answering these questions.
Take the Quiz
HRD Antwerp CEO Paul De Wachter
GradingOct 03, 2025
Grading Lab HRD Antwerp Names New CEO

Diamond industry banking veteran Paul De Wachter will take on the role in January 2026.

Taylor Swift Kallati sapphire ring
TrendsOct 03, 2025
Piece of the Week: Kallati’s Pink Sapphire Ring

Taylor Swift flaunts an Elizabeth Taylor-esque gemstone in promo for her new album, “The Life of a Showgirl.”

gia-edu main image.png
Brought to you by
A Brilliant Future Is Here

Online education from GIA experts.

Boucheron Quatre Sand Collection
CollectionsOct 02, 2025
Boucheron Debuts Cuffs Crafted With 3D-Printed Sand

Its “Quantre Sand” capsule was made using a 3D sand printing technique borrowed from the automotive and aeronautics industries.

Stock image of crime scene tape
CrimeOct 02, 2025
$1M in Jewelry Stolen in Northern California Smash and Grab

Four individuals have been charged in the “takeover-style” robbery of Heller Jewelers last month, and additional charges are expected.

Neil Lane and Boucheron bow tie brooch
MajorsOct 02, 2025
Neil Lane Jewelry Exhibition Coming to Toledo Museum of Art

“Radiance and Reverie” will showcase more than 150 jewels from Lane’s personal collection by Tiffany & Co., Cartier, and more.

Just Jules opal necklace
TrendsOct 02, 2025
Amanda’s Style File: October’s Colorful Show

The month’s birthstones, tourmaline and opal, complement the palette of autumn.

Peter Smith National Jeweler columnist
ColumnistsOct 01, 2025
Peter Smith: Why Vendor Success Starts With Self-Reflection

Smith shares the importance of looking at your company with openness and honesty to identify opportunities you may be missing.

Plah Black Swan Earrings
EditorsOct 01, 2025
Playing Favorites: The Best Jewelry From Vicenzaoro

Associate Editor Natalie Francisco visited Italy to spot jewelry trends at the September Vicenzaoro show and share her top finds.

People shopping in a mall
SurveysOct 01, 2025
Consumer Confidence Hits 5-Month Low in September

Respondents were concerned about job availability and rising prices.

Pandora executives Alexander Lacik and Berta de Pablos-Barbier
MajorsSep 30, 2025
Pandora CEO to Retire in 2026, Hand Reins to CMO

Alexander Lacik has led Pandora since 2019. Berta de Pablos-Barbier will succeed him, the first woman to head the company.

Gavel near stacks of books
CrimeSep 30, 2025
2 Suspects Charged in $300K Sleight-of-Hand Jewelry Store Scam

Two men allegedly used counterfeit bills to purchase luxury watches and jewelry from a North Carolina jeweler.

Billie Eilish and Finneas O’Connell John Hardy Lovestruck Collection
CollectionsSep 30, 2025
Billie Eilish, Finneas Partner with John Hardy

The “Lovestruck” collection, designed with the Academy and Grammy award-winning siblings, is the brand’s first lab-grown diamond offering.

Spinelli Kilcollin Market Highland Park
IndependentsSep 30, 2025
Spinelli Kilcollin Announces Residency in Dallas

The brand, celebrating its 15th anniversary, has popped up at Market, a luxury fashion destination in Highland Park Village.

Nina Pugliese Henne Jewelers
IndependentsSep 29, 2025
Nina Pugliese, Longtime Henne Jewelers Employee, Dies at 65

She was remembered as a creative and generous woman of faith, who also had a sweet tooth.

Kwait White and Yellow Gold Diamond Earrings
TrendsSep 29, 2025
Amanda’s Style File: Ear Focus

Move over neck mess, the ear story is the way to make a layering statement today.

Mark Henry Leandra Medine Cohen
IndependentsSep 29, 2025
Mark Henry Jewelry to Debut in Canada

The New York-based brand is set to launch a limited-time offering for the holiday season at Holt Renfrew in Toronto.

Overnight volume 7 bridal catalog
MajorsSep 29, 2025
Overnight Releases New Bridal Catalog

The “Volume 7” bridal catalog features best-selling engagement rings, trending styles, and a new section highlighting anniversary bands.

Hand holding holiday shopping bags
SurveysSep 26, 2025
Online Shopping, Influencers to Drive Holiday Spending, Mastercard Says

Holiday sales growth is expected to slow as consumers grapple with inflation and tariff-related uncertainty.

Austin Shines Jewelry Award
Events & AwardsSep 26, 2025
Winners of Austin Jewelry Design Contest Announced

Jamie Turner Designs is among the winners of the local “Austin Shines” contest, hosted by Eliza Page, a jewelry store in Austin, Texas.

Kwit Square Signet Pinky Ring in Red and Azure
TrendsSep 26, 2025
Piece of the Week: Kwit Jewelry’s Square Signet Pinky Ring

The red and azure colorway is one of many fun enamel pairings offered, bringing whimsy to the classic style of a monogramed signet ring.

Jewelers of America Fly In
Policies & IssuesSep 25, 2025
JA CEO Provides Tariff Update Following Annual Fly-In

A trade deal with Switzerland seems probable, but reaching an agreement with India remains a challenge, David Bonaparte said.

×

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