Associate Editor Lauren McLemore headed out West for a visit to Potentate Mining’s operation hosted by gemstone wholesaler Parlé Gems.
In NY, Sotheby’s to sell jewels of a Mellon
Jewelry that once belonged to Rachel Lambert Mellon, a horticulturalist and art collector who died earlier this year at the age of 103, will hit the auction block at Sotheby’s in November, including a fancy vivid blue diamond estimated to garner up to $15 million.

Mellon’s collection of jewels and objects of vertu, small objects created from precious materials used as works of art or that have a practical purpose, will be offered Nov. 20 and 21 at Sotheby’s New York.
Highlighting Mellon’s jewelry is a 9.75-carat pear-shaped fancy vivid blue diamond of VVS2 clarity. The potentially internally flawless stone, mounted in platinum, is accompanied by a Gemological Institute of America report and is expected to sell for up to $15 million.
Another pear-shaped fancy blue diamond, this one weighing 9.15 carats and also mounted in platinum, has a pre-sale high estimate of $1.5 million.
A circa 1900 gold and diamond rivière necklace by Cartier is set with 29 old European cut diamonds weighing a total of 111 carats, with a 4.20-carat round fancy deep yellow diamond on the clasp. The necklace is expected to sell for $1.2 to $1.5 million.
A pair of 18-karat gold, sapphire and diamond brooches by Van Cleef & Arpels is expected to fetch up to $35,000.
“Mrs. Mellon’s personal jewels and objects of vertu reflect her close relationships with the designers she loved,” Sotheby’s said. “Pieces from Verdura, Schlumberger and Givenchy appear in the collection, as well as period jewels from Cartier, Van Cleef & Arpels and Black Starr & Frost.
The auction will include an attractive array of wearable daytime jewels, gold accessories and objects of vertu, both modern and vintage.”
In addition to jewelry and objects of vertu, Mellon’s fine art, furniture, porcelain, silver and glassware also will be up for auction. Together, the lots are expected to achieve more than $100 million.
The Latest

Fordite is a man-made material created from the layers of dried enamel paint that dripped onto the floors of automotive factories.

Gilbertson has worked as a researcher, jeweler, lapidary artist, appraiser, and business owner throughout his decades in the industry.

With their unmatched services and low fees, reDollar.com is challenging some big names in the online consignment world.

A decision likely won’t come until January 2026 at the earliest, and the tariffs remain in effect until then.


Located in the revamped jewelry hall at the retailer’s New York City flagship, this opening is Tabayer’s first shop-in-shop.

The new, free app offers accessible educational content, like games and podcasts, for U.S. retailers.

Jewelers of America is leading the charge to protect the industry amidst rising economic threats.

As the gold price rises, the manufacturer is offering a 100 percent payout through Sept. 30 for gold clean scrap.

Jacob & Co. partnered with the German technology company on two pairs of headphones, one set with diamonds and the other with sapphires.

Guillermo del Toro’s 2025 “Frankenstein” will feature 27 jewels and objects from the storied brand, including pieces from its archives.

The Waldorf Astoria New York’s grand reopening this past summer means a homecoming for the industry group’s annual event.

Anglo plans to merge with Teck Resources Ltd. to form Anglo Teck. The deal changes nothing about its plans to offload De Beers.

The nonprofit awarded four students pursuing a professional career in jewelry making and design with $2,250 each.

The Texas-based jeweler has also undergone a brand refresh, debuting a new website and logo.

The two organizations have finalized and signed the affiliation agreement announced in May.

The single-owner sale will headline Sotheby's inaugural jewelry auction at the Breuer building, its new global headquarters, this December.

From sunrise yoga to tariffs talks, these are some events to check out at the upcoming inaugural event.

Smith recalls a bit of wisdom the industry leader, who died last week, shared at a diamond conference years ago.

The “Victoria” necklace features a labradorite hugged by diamond accents in 18-karat yellow gold.

Two lower courts have moved to block the import taxes, which will remain in place as the legal battle continues.

The Kansas City Chiefs quarterback shares Hublot’s dedication to pursuing greatness, the Swiss watchmaker said.

The Type IIa stone, recovered from Botswana’s Karowe diamond mine last month, features unique coloration.

Breitling is now the NFL’s official timepiece partner, a move that puts the brand in front of the millions of Americans who watch football.

NYCJAOS is set for Nov. 21-23 in New York City’s Chelsea neighborhood.

U.S.-based investment company SMG Capital LLC is the new owner of the luxury brand.