CollectionsDec 05, 2025
Piece of the Week: Robinson Pelham’s ‘Tsar Star’ EarringsThe new pink sapphire version of the piece dances with its wearer in the brand’s “Icons After Dark” holiday campaign.
SourcingSep 28, 2016
London Museum to Put 9,381-Carat Blue Topaz on Display
On long-term loan from the family who discovered it in Brazil, “The Ostro Stone” will be available for public viewing at the Natural History Museum starting Oct. 19.
The 9,381-carat blue topaz at center, dubbed “The Ostro Stone,” was discovered in 1960 in Minas Gerais, Brazil, by British gemstone pioneer and explorer Max Ostro.
London--The U.K. will present a unique opportunity for gemstone lovers beginning next month as a flawless, faceted blue topaz, thought to be the largest of its kind, goes on display.
Starting Oct. 19, a 9,381-carat blue topaz called “The Ostro Stone” will go on permanent display to the public in the London Natural History Museum’s Minerals gallery.
British gemstone pioneer and explorer Max Ostro discovered the stone in its natural form in 1960 in Minas Gerais, Brazil, and the topaz has been in the family vault ever since. It is being put on display now through a long-term loan from his son, Maurice Ostro, chairman of Ostro Minerals.
It’s approximately 6 inches in length and 4 inches wide, with its deep blue color resulting from a treatment applied when it was in its rough state.
The museum said it’s the first large cut topaz of its kind to go on display there, showing alongside other important specimens from its mineral collections. It did not disclose the value of the stone.
The Ostro Stone will be unveiled at a private launch event in the Museum’s Hintze Hall on Oct. 6, with performances from fashion designer Daphne Guinness and music producer Tony Visconti.
Three new pieces of “wearable art” featuring topaz donated by Ostro and designed by contemporary artists Isaac Julien, Nicole Wermers and Catherine Yass also will be unveiled.
Though at the start of his career in the gemstone world Max Ostro was responsible for introducing a number of gems from South America to the colored stone industry in the Far East, he was long enthralled with blue topaz in particular, working closely with it until his death in 2010.
He has been credited with helping the gem reach the popularity it has to day, and the terms London blue and Swiss blue also are associated with the Ostro family.
Mike Rumsey, senior curator of the museum’s Minerals Collection, said, “This stone is an excellent example of how as humans, we have crafted beautiful and desirable objects from the natural mineral specimens we find around us, like those that we preserve in the collections at the museum. It will be on display alongside some of our world leading collection of minerals and gems, which is studied by scientists here to find new sources of minerals, gemstones and metals.”
More on Sourcing
The Latest
TrendsDec 05, 2025
Pantone’s Color of the Year for 2026 Is … WhiteA choice that’s generated a lot of commentary, Pantone says “Cloud Dancer” marks a fresh start and encourages relaxation and creativity.
MajorsDec 05, 2025
Stuller Releases ‘Wrapped in Wonder’ CampaignThe manufacturer’s holiday campaign features a gift guide filled with trending designs and jewelry that can be personalized.
Brought to you by
Impacting Tomorrow TodayHow Jewelers of America’s 20 Under 40 are leading to ensure a brighter future for the jewelry industry.
CrimeDec 04, 2025
Man Arrested After Allegedly Swallowing Fabergé Egg PendantThe man was charged with theft, accused of ingesting the necklace while in a jewelry store in Auckland, New Zealand.
Weekly QuizDec 04, 2025
This Week’s QuizTest your jewelry news knowledge by answering these questions.
IndependentsDec 04, 2025
Step Inside JR Dunn Jewelers’ Giant New Store The Florida independent expanded its store from 8,000 to 14,000 square feet, fulfilling the vision of its late co-founder, Jim Dunn.
Supplier BulletinDec 04, 2025
Introducing Shop Natural Day: A New Movement Celebrating Natural DiamondsSponsored by De Beers Group
Brought to you by
Roseco Releases New Full-Line CatalogRoseco’s 704-page catalog showcases new lab-grown diamonds, findings, tools & more—available in print or interactive digital editions.
WatchesDec 04, 2025
Casio Shrinks its G-Shock WatchThe classic 5600 series G-Shock has been scaled down to about a tenth of its size, becoming a fully functioning watch ring.
Events & AwardsDec 04, 2025
AGA Announces 2026 Tucson Speaker LineupThe association’s annual conference and gala will take place Feb. 4, 2026, during the Tucson gem shows.
Events & AwardsDec 04, 2025
CBG Announces Speaker Lineup for 2026 Miami Event The January show will include a workshop for jewelry retailers on implementing AI to strengthen their businesses.
TrendsDec 03, 2025
Miley Cyrus Debuts Edgy Engagement RingFellow musician Maxx Morando proposed to the star with a chunky, cushion-cut diamond ring designed by Jacquie Aiche.
Policies & IssuesDec 03, 2025
Costco Joins Growing Wave of Retailers Suing for Tariff Refunds The retailer, which sells billions in fine jewelry and watches, is suing the Trump administration and U.S. Customs and Border Patrol.
SurveysDec 03, 2025
A Record 202.9M Shoppers Turned Out Thanksgiving WeekendBlack Friday is still the most popular shopping day over the five-day holiday weekend, as per the National Retail Federation’s survey.
AuctionsDec 03, 2025
Fabergé’s 'The Winter Egg' Achieves Record $30MThe historic egg, crafted for Russia's ruling family prior to the revolution, was the star of Christie’s recent auction of works by Fabergé.
FinancialsDec 02, 2025
Signet Jewelers’ Q3 Sales Up Amid Continued Focus on Lower Price PointsThe retailer offered more fashion jewelry priced under $1,000, including lab-grown diamond and men’s jewelry.
CollectionsDec 02, 2025
Briony Raymond Introduces First FragranceThe eau de parfum is held in a fluted glass bottle that mirrors the decor of the brand’s atelier, and its cap is a nod to its “Sloan” ring.
MajorsDec 02, 2025
Lee Krombholz Takes Over as Chair of MJSA Education FoundationIn addition, a slate of new officers and trustees were appointed to the board.
IndependentsDec 02, 2025
RJO Welcomes Its 1,200th Retail MemberWitt’s Jewelry in Wayne, Nebraska, is the organization’s new milestone member.
CrimeDec 01, 2025
Fourth Man Charged in Louvre Jewelry HeistThe man, who has a criminal history, is suspected of being the fourth member of the four-man crew that carried out the heist.
AuctionsDec 01, 2025
Christie’s Presents ‘Splendor & Style’ CollectionThe single-owner collection includes one of the largest offerings of Verdura jewels ever to appear at auction, said Christie’s.
IndependentsDec 01, 2025
Lustig Jewelers’ New Owner Is a Fellow Chicago JewelerMichael Helfer has taken the reins, bringing together two historic Chicago jewelry names.
MajorsDec 01, 2025
PGI Debuts Platinum-Filled Holiday Gift GuideThe guide features all-new platinum designs for the holiday season by brands like Harwell Godfrey, Ritani, and Suna.
FinancialsNov 26, 2025
Movado CEO Talks Tariffs, Growing Interest in Accessible Luxury WatchesDuring its Q3 call, CEO Efraim Grinberg discussed the deal to lower tariffs on Swiss-made watches, watch market trends, and more.
TrendsNov 26, 2025
Piece of the Week: Rosior’s Pumpkin RingRosior’s high jewelry cocktail ring with orange sapphires and green diamonds is the perfect Thanksgiving accessory.
IndependentsNov 26, 2025
Greenwich St. Jewelers Launches Colorful Holiday CampaignThe “Embrace Your True Colors” campaign features jewels with a vibrant color palette and poetry by Grammy-nominated artist Aja Monet.
MajorsNov 26, 2025
Serafino Consoli Names New VP of Sales, Brand Development for the AmericasLuxury veteran Alejandro Cuellar has stepped into the role at the Italian fine jewelry brand.
