SurveysJul 27, 2026
Jewelry Leads Luxury Market Amid Stabilization, Bain SaysBain & Company delved into the trends shaping the luxury market, the impact of AI, and more in its recent study.
AuctionsAug 23, 2017
4-Carat Fancy Blue Diamond to Top Bonhams London’s Sale
The stone, headlining the Fine Jewellery sale Sept. 20, could sell for as much as $1.9 million.
This 4-carat pear-shaped fancy intense blue diamond will be the top lot at Bonhams London’s upcoming Fine Jewellery sale.
London--The highlight of Bonhams London’s upcoming fine jewelry sale will be a fancy intense blue diamond weighing 4.03 carats.
Pink and blue diamonds have been dominating the auction scene of late, with a number of them setting auction records, including The CTF Pink and the Oppenheimer Blue.
In fact, colored diamonds have increased in value, on average, by 100 percent over the past decade, with blue stones showing the strongest growth over the past 12 months at 5.5 percent, according to the Knight Frank Luxury Investment Index based on data from the Fancy Color Research Foundation.
When the pear-shaped blue diamond hits the auction block at Bonhams Sept. 20 after having been in a private collection in the U.K. for the past three decades, it is expected to sell for between $1.5 million and $1.9 million.
Meanwhile, the sale will feature 188 additional lots, including a selection of white and colored diamonds, sapphires from Kashmir, Burma and Sri Lanka, signed jewelry from Cartier and Van Cleef & Arpels and the private collection of Anglo-Italian designer Andrew Grima, the largest private collection of jewelry from the designer ever to go to auction.
The No. 2 lot of the sale is a fancy colored diamond brooch featuring a 4.83-carat square step-cut fancy gray-blue diamond with fancy dark brown-greenish yellow step-cut diamonds on either side--weighing 2.51 carats and 2.38 carats, and a suspended pear-shaped fancy pink diamond drop weighing 1.90 carats. It could garner between $834,000 and $1.1 million.
Following this piece is a Kashmir sapphire single-stone ring of 9.61 carats. The octagonal step-cut sapphire has no indications of heating, Bonhams said, and is estimated to sell for between $642,000 and $899,000.
This mid-20th century brooch featuring fancy colored diamonds is estimated to sell for as much as $1.1 million.
Another signed Cartier piece in the sale: these Art Deco diamond clip brooches circa 1935, estimated at between $51,300 and $77,000
This Cartier emerald and diamond bracelet dates from the 1960s and is expected to sell in the range of $64,200 to $89,900 next month.
This old-cut marquise diamond weighing 4.61 carats is D in color, VVS2 clarity and potentially flawless. It is expected to sell for as much as $128,400 next month.
A Kashmir sapphire ring, weighing 9.61 carats, expected to sell for between $642,000 and $899,000
Also among the top lots will be a piece perfect for old-cut diamond lovers: A 4.61 carat old marquise-cut type IIb diamond single-stone ring that could sell for between $102,700 and $128,400.
Bonhams will also be auctioning a number of signed pieces from Cartier as part of its sale.
This includes a pair of Art Deco diamond clip brooches circa 1935, estimated at between $51,300 and $77,000, and, adding more color to the sale, an emerald and diamond bracelet by Cartier. It features a series of alternating step- and octagonal-cut emeralds, accented on both sides by brilliant-cut diamonds, and has a pre-sale estimate of $64,200 to $89,900.
Full details of the lots to be auctioned at Bonhams London September Fine Jewellery sale will be put
Editors' Picks
Sponsored by
online at the end of this month.
More on Auctions
The Latest
SourcingJul 27, 2026
‘Rubies’ Goes on Display at Harvard MuseumThe exhibition reveals the gemology, geology, and cultural history of the iconic red gemstone.
Policies & IssuesJul 24, 2026
New Trump Tariffs: What They Mean for Jewelry The new sweeping slate of tariffs impacts 60 countries, including India, China, Thailand, Hong Kong, and the United Arab Emirates.
Brought to you by
Wedding Band Trends 2026: Personalization Takes Center StageColored gemstones, artisan finishes, mixed metals, and meaningful details are shaping demand in bridal jewelry.
TrendsJul 24, 2026
Amanda’s Style File: Ode to ‘The Odyssey’From coin pendants to diamond shields, these old world-inspired jewels are the perfect accessory for an epic journey.
Weekly QuizJul 23, 2026
This Week’s QuizTest your jewelry news knowledge by answering these questions.
TrendsJul 24, 2026
Courtney Leidy’s Silk Cord Pendants Center Unexpected Pairings Our Piece of the Week pairs a checkerboard-cut amethyst with an ivy green silk cord.
PodcastsJul 23, 2026
Episode 7: Reinhold Jewelers on the Power of RelationshipsMildred Marcano Abrams and Yael Reinhold join the podcast to talk community connections, holiday plans, and preserving Reinhold’s legacy.
Brought to you by
Building the Future of Jewelry Retail: DCA Expands Education, Leadership Development, and Workforce SolutionsDCA is preparing the next generation of professionals by supporting workforce development, leadership growth, and career advancement.
SourcingJul 23, 2026
De Beers’ Production Jumps 88 Percent in Q2 Production also was up in the first half of 2026 but is expected to “substantially” decrease in H2 as two key mines undergo maintenance.
CollectionsJul 23, 2026
Silvia Furmanovich’s New Collection Travels Back to the 1920s“Art Deco” fuses ancestral techniques, rare materials, and modern perspectives as a tribute to the optimism and curiosity of the movement.
IndependentsJul 23, 2026
Sissy's Log Cabin Opens Casino StoreThe jeweler’s newest store is inside Arkansas’ Saracen Casino Resort.
WatchesJul 23, 2026
Movado Inks Licensing Deal With Kate Spade New YorkThe watch company will design, manufacture, and distribute Kate Spade New York watches.
Policies & IssuesJul 22, 2026
Trump to Put 50% Tariff on Canadian Goods The higher tax is set to go into effect in August and will apply to loose polished diamonds as well as precious and base metals jewelry.
CollectionsJul 22, 2026
Monica Rich Kosann’s High Jewelry Is FruitfulThe “Enchanted Garden” series features a cherry, lemon, and pear that each hold a little secret inside.
IndependentsJul 22, 2026
Liljenquist Beckstead Opens Rolex New BoutiqueIt’s located in Tysons Galleria, an upscale shopping center in the Washington, D.C., metro area.
Events & AwardsJul 22, 2026
NY Now Returns in August Under New OwnershipThe show, recently acquired by Rockview Management Group, will be held at New York City’s Javits Center from Aug. 2-4.
ColumnistsJul 21, 2026
Sherry Smith: Shattering the Illusion of the ‘Either/Or’ Diamond MarketSmith offers retailers guidance on creating an environment where natural and lab-grown diamonds can both thrive.
Events & AwardsJul 21, 2026
Apollo Funds Completes Emerald AcquisitionFormer Emerald President and CEO Hervé Sedky has transitioned to the role of senior advisor.
CollectionsJul 21, 2026
Graff’s New Butterfly High Jewelry Brooches MetamorphosizeThe 12-piece capsule collection transforms from brooches to pendants.
SourcingJul 21, 2026
Anglo Reportedly Selects Gareth Penny’s Consortium as Top Bidder for De BeersA Botswana government official told lawmakers Anglo has selected The Global Diamond Consortium, an entity chaired by Penny, to buy De Beers.
Policies & IssuesJul 20, 2026
Tariffs on Brazil to Increase But Rough Gemstones ExemptThe new tariff, imposed after a Trump administration study, is 25 percent and will stack on top of existing tariffs.
CollectionsJul 20, 2026
Vhernier Transforms ‘Freccia’ Collection Into High JewelryThe collection from 2014 has been reinterpreted into high jewelry with its signature triangular-shaped elements.
MajorsJul 20, 2026
Krista Collins Walters Promoted to Publisher of InstoreShe will also take on the role of vice president of jewelry for SmartWork Media, a newly created position.
Events & AwardsJul 20, 2026
TJS Accepting Speaker Proposals for 2027 EventOrganizers are looking for presentations on topics like manufacturing, technology and research, bench work, gemstones, and sustainability.
CollectionsJul 17, 2026
HOWL Taps Shailene Woodley for ‘Home Sweet Home’ CampaignWoodley is seen in the campaign wearing our Piece of the Week, the “Frida” collar featuring 13 pieces of hand-carved Venetian glass.
SourcingJul 17, 2026
U.K. Woman Pays £5 for £15K Diamond Ring at Car Boot SaleA WeBuyVintage jewelry expert uncovered how much the flea market find was actually worth.
SourcingJul 17, 2026
Diamond Dealer Jeff Pancis Pens MemoirThe founder of natural colored diamond wholesaler Pancis Gems shares stories from his five decades in the industry.
