The gemstone supplier and manufacturer acquired the remarkable 104-gram Zambian emerald at Gemfields’ auction in May.
Sotheby’s Is Selling This Perfect 102-Carat Diamond with No Reserve
Online bidding for the D flawless stone starts Sept. 15, with the live in-person auction set for early October in Hong Kong.

Hong Kong—This fall, a 102.39-carat D flawless diamond will go up for sale at Sotheby’s Hong Kong, with what the auction house describes as an “unprecedented twist” for these unusual times.
The oval-shaped stone has no reserve price and is being offered by the auction house without a pre-sale estimate, Quig Bruning, head of Sotheby’s jewelry department in New York, explained in a phone interview Wednesday.
A reserve price is the confidential minimum selling price agreed upon between the auction house and the consigner.
Bruning said sometimes, items are offered at auction without reserve—Bonhams, for example, is selling a collection of intaglios and cameos without reserve at a sale later this month—but there’s usually still an estimate given.
This stone will go up on the auction block without either, meaning the highest bid will be the winning bid.
“This is absolutely going to be a gauge of the market,” he said. “We are truly looking at, what will the market bear?”
Despite the toll COVID-19 has taken on the global economy and the havoc it’s wreaked on live events, Bruning said Sotheby’s has had success selling jewelry online and at the live auctions it has held this year.
He pointed to the fancy colored hearts sold in Hong Kong this summer as examples.
He said the auction house has confidence in the value of large, exceptional diamonds, and views it as an “ideal time” to offer this stone via a hybrid online-offline sale and “set the market.”
The 102.39-carat D flawless diamond has excellent polish and symmetry; Bruning called it “an extraordinary stone” that is “a beautiful example of a diamond.”
“It just transfixes anyone who looks at it,” he said. “There’s something above and beyond that this stone possesses. There’s a life and a character to it that you don’t normally see.”
Though Sotheby’s is not revealing the name of the company that consigned the diamond for sale, it did say Diacore cut and polished the stone over the course of a year from a rough diamond weighing 271 carats (pictured above) discovered at De Beers’ now-closed Victor Mine in Canada in 2018.
The auction house said it is one of only eight diamonds of “regular shape” (meaning modern cuts, not old mine, old European, etc.) that are over 100 carats and D color and flawless or internally flawless ever to be offered at auction.
Sold for between $11
The 102.39-carat stone is also the second-largest oval-shaped diamond of its kind to appear at auction, surpassed only by the 118.28-carat oval Sotheby’s sold for $30.8 million, or $260,252 per carat, in Hong Kong in 2013.
Sotheby’s will sell the diamond in a live single-lot auction in Hong Kong on Oct. 5.
Bruning said the auction house does plan to have bidders present at the auction—in addition to taking absentee, online and phone bids—though it will ultimately depend on the situation on the ground in Hong Kong at that time.
By-appointment-only previews are taking place in Beijing, Shanghai, New York and Taipei before the stone returns to Hong Kong for the sale.
Online bidding opens next Tuesday, Sept. 15.
The Latest

Two suspects offered to trade the woman a “winning” lottery ticket for her jewelry.

Finsch has been in business rescue since May, and owner Petra Diamonds said it sees no viable path forward for the mine.

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

Michel Patrick DeSalles was sentenced after pleading guilty to the 2017 murder of Omid Gholian, who owned a jewelry store in Manhattan.


Longtime industry executive Beth Miller has taken on the role.

Jamie Cygielman will take on the role on Aug. 24.

Colored gemstones, artisan finishes, mixed metals, and meaningful details are shaping demand in bridal jewelry.

Moore, Polly’s husband, is remembered as a family man with an easygoing spirit and a love for sports and the outdoors.

Duvall O’Steen and Jen Cullen Williams share the best ways to display, present, and explain colored gemstones to younger customers.

The mid-year conference for jewelry and watch appraisers will take place Sept. 5-6 on Zoom.

Honest Hands Ring Co. Founder Benjamin Bosworth shared his thoughts on jewelry technology and why AI can never replace the human element.

QVC Group President and CEO David Rawlinson is temporarily being replaced by a familiar face, former QVC CEO Mike George.

The brand also added two one-of-a-kind brown diamond pieces to the “Sanssouci” series of its “Gardens” collection.

Ostbye took home top vendor honors at the Independent Jewelers Organization’s show, held last month in Kentucky.

Sponsored by Stratus Estate Buyers

Cloud, who will officially join Blue Nile on Monday, spent 26 years at Tiffany & Co. and founded jewelry brand Roseate.

Garcia will take over from the company’s current CFO, Anders Boyer, who is retiring at the end of November.

Etsy CEO Kruti Patel Goyal explained why the company is letting go more than 200 employees as its performance improves.

The “Star Gazer” pendant, our Piece of the Week, is Syna’s tribute to curiosity and the discovery of something new.

Museum officials are looking to the public to help cover the “exceptional” costs involved in recovering from the July 5 smash-and-grab.

The overhaul includes enhanced employee safety training and trendy earring styles, including lab-grown diamond studs.

The retailer said it had its biggest Mother’s Day ever, with strong demand for higher-priced jewelry.

“Handwork: Handcrafted Objects that Made America” features historic and contemporary works, including a Diné squash blossom necklace.

The Armenian Jewelers Association’s East Coast chapter has also elected its 2026–2027 board of directors.

Onyx Partners has submitted a second offer to buy the department stores after its first offer fell through last year.

Solomon Brothers Jewelers has partnered with local cocktail bar Roaring Social on a new martini garnished with a tennis necklace.























