GradingFeb 02, 2026
IGI to Acquire American Gemological Laboratories IGI is buying the colored gemstone grading laboratory through IGI USA, and AGL will continue to operate as its own brand.
SourcingFeb 13, 2014
Petra’s big blue diamond goes for $25M
Petra Diamonds announced Friday that it has sold the 29.6-carat rough blue diamond it uncovered at the Cullinan mine in South Africa last month.
South African company Golden Yellow Diamonds purchased Petra Diamonds’ 29.6-carat blue diamond on Friday for $25.6 million, or $862,780 per carat. Petra described the stone, which was found last month, as “exceptional.”
London--Petra Diamonds announced Friday that it has sold the 29.6-carat rough blue diamond it uncovered at the Cullinan mine in South Africa last month.
South African company Golden Yellow Diamonds for Cora International NY purchased the stone for $25.6 million, or $862,780 per carat.
When the stone was unearthed in January, Petra described it as “exceptional,” noting that it is an outstanding vivid blue with extraordinary saturation, tone and clarity.
“This sale result affirms this stone as one of the most important blue diamonds ever recovered,” Petra CEO Johan Dippenaar said. “An additional allure is the diamond’s heritage from the Cullinan mine in South Africa, which is well known as the source of many of the world’s most spectacular diamonds, including the two main diamonds in the British Crown Jewels, and which is the world’s most important source of very rare blue diamonds.”
RELATED CONTENT: Nearly 30-carat blue diamond found in S. Africa
Since Petra acquired the Cullinan mine in June 2008, the company has uncovered four notable, large blue diamonds, three of which sold for more than $8 million.
The highest grossing of these was a 25.5-carat blue that sold for $16.9 million last year, as well as a 26.6-carat piece of blue rough that sold for $9.5 million in 2009, and a 39.9-carat diamond that sold for $8.8 million in 2008.
RELATED CONTENT: Large rough brings big money for mining cos.
London-based Petra Diamonds has interest in six producing mines, five in South Africa--the Finsch, Koffiefontein, Kimberley Underground, Helam, and Cullinan--and the Williamson mine in Tanzania.
The company also has an exploration program in Botswana.
Editors' Picks
Sponsored by
More on Sourcing
The Latest
CrimeFeb 02, 2026
Ylang 23’s Dallas Store BurglarizedThe Texas jeweler said its team is “incredibly resilient” and thanked its community for showing support.
EditorsFeb 02, 2026
Stars Choose Chokers, Elongated Earrings at 2026 GrammysFrom cool-toned metal to ring stacks, Associate Editor Natalie Francisco highlights the jewelry trends she spotted at the Grammy Awards.
Brought to you by
The MJSA Mentor & Apprenticeship Program: Attracting & Training the Next Generation of Bench JewelersLaunched in 2023, the program will help the passing of knowledge between generations and alleviate the shortage of bench jewelers.
CollectionsFeb 02, 2026
2026 Winter Olympic Medal Design Symbolizes UnityThe medals feature a split-texture design highlighting the fact that the 2026 Olympics are taking place in two different cities.
Weekly QuizJan 29, 2026
This Week’s QuizTest your jewelry news knowledge by answering these questions.
SurveysJan 30, 2026
These Are the Top Brands of 2026, Says YouGovFrom tech platforms to candy companies, here’s how some of the highest-ranking brands earned their spot on the list.
CollectionsJan 30, 2026
Follow the Beat With Etiq’s ‘Khol’ RingThe “Khol” ring, our Piece of the Week, transforms the traditional Indian Khol drum into playful jewelry through hand-carved lapis.
Brought to you by
How Jewelers Can Fight Back Against Cell JammersCriminals are using cell jammers to disable alarms, but new technology like JamAlert™ can stop them.
MajorsJan 30, 2026
Arch Crown’s 2026 ‘Tag & Label’ Catalog Is HereThe catalog includes more than 100 styles of stock, pre-printed, and custom tags and labels, as well as bar code technology products.
CollectionsJan 29, 2026
Ghirardelli’s ‘Chocolocket’ Returns for Valentine’s DayThe chocolatier is bringing back its chocolate-inspired locket, offering sets of two to celebrate “perfect pairs.”
AuctionsJan 29, 2026
These Were Bonhams’ Top 10 Jewelry Lots in 2025The top lot of the year was a 1930s Cartier tiara owned by Nancy, Viscountess Astor, which sold for $1.2 million in London last summer.
WatchesJan 29, 2026
Audemars Piguet Opens AP House in AtlantaThe Swiss watchmaker has brought its latest immersive boutique to Atlanta, a city it described as “an epicenter of music and storytelling.”
ColumnistsJan 28, 2026
Peter Smith: Setting the Next Generation Up for SuccessIn his new column, Smith advises playing to your successor's strengths and resisting the urge to become a backseat driver.
SurveysJan 28, 2026
Consumer Confidence Falls Below Pandemic Lows in JanuaryThe index fell to its lowest level since May 2014 amid concerns about the present and the future.
IndependentsJan 28, 2026
Foundrae Heads to Aspen for Latest Store OpeningThe new store in Aspen, Colorado, takes inspiration from a stately library for its intimate yet elevated interior design.
FinancialsJan 28, 2026
Tiffany & Co., Bulgari Sales Resilient as LVMH’s 2025 Sales SlipThe brands’ high jewelry collections performed especially well last year despite a challenging environment.
CollectionsJan 27, 2026
De Beers London, GemFair Debut New Collection Highlighting Artisanal DiamondsThe collection marks the first time GemFair’s artisanal diamonds will be brought directly to consumers.
SourcingJan 27, 2026
GemGuide Launches Pricing for Montana SapphiresThe initial charts are for blue, teal, and green material, each grouped into three charts categorized as good, fine, and extra fine.
TechnologyJan 27, 2026
Clientbook Launches Appointment Booking ToolThe new tool can assign the appropriate associate based on the client or appointment type and automate personalized text message follow-ups.
SourcingJan 26, 2026
Tucson Preview 2026: Earthy Tones and Innovative Shapes Buyers are expected to gravitate toward gemstones that have a little something special, just like last year.
SourcingJan 26, 2026
Angolan Diamond Cos. Join NDC as Rio Tinto, Murowa Exit Endiama and Sodiam will contribute money to the marketing of natural diamonds as new members of the Natural Diamond Council.
MajorsJan 26, 2026
Francesca’s To Close All StoresThe retailer operates more than 450 boutiques across 45 states, according to its website.
MajorsJan 26, 2026
BIJC Names 5 New Board MembersThe new members’ skills span communications, business development, advocacy, and industry leadership.
CollectionsJan 26, 2026
Tiffany & Co. Celebrates 189 Years of Love StoriesThe jeweler’s 2026 Valentine’s Day campaign, “Celebrating Love Stories Since 1837,” includes a short firm starring actress Adria Arjona.
GradingJan 26, 2026
DCA Updates Colored Gemstone CourseThe new features include interactive flashcards and scenario-based roleplay with AI tools.
MajorsJan 23, 2026
Watches of Switzerland Acquires 4-Store Jewelry Chain in TexasFamily-owned jewelry and watch retailer Deutsch & Deutsch has stores in El Paso, Laredo, McAllen, and Victoria.
WatchesJan 23, 2026
Damiani Group to Acquire Baume & MercierThe Italian luxury company purchased the nearly 200-year-old Swiss watch brand from Richemont.
