Auctions

Buyers Went Crazy for Hester Diamond’s Mineral Collection

AuctionsFeb 03, 2021

Buyers Went Crazy for Hester Diamond’s Mineral Collection

Every lot was sold at the Sotheby’s auction, with 98 percent topping their highest pre-sale estimates.

20210203_Emerald.jpg
This Colombian emerald specimen shattered its pre-sale estimate high of $5,000, selling for $81,900 at Sotheby’s auction of Hester Diamond’s mineral collection.
London—The late Hester Diamond’s eye for collecting works of art was obvious at the recent auction of her mineral specimens, where almost all lots sold for well above what was expected.

Diamond was a prominent New York interior designer and philanthropist (and mother of Beastie Boy “Mike D”).

She got her start at an antiques gallery before she and her first husband, Harold, became enmeshed in the fine art world and built up quite a collection of their own.

After Harold’s death, Hester began to sell of much of the modern art she had collected to focus on the Old Masters, a passion that blossomed with her second husband, Ralph Kaminsky.

She was also interested in minerals, collecting specimens with aesthetics that appealed to her, and interior design.

Her passion for interior design was reflected in the way she displayed everything in her home, contrasting Old Masters with contemporary furniture and displaying her minerals on colorful, custom-made shelves.

Diamond died in January 2020 at the age of 91. 

Hester Diamond showcased her minerals in a way that balanced function and aesthetic.
Hester Diamond showcased her minerals in a way that balanced function and aesthetic.

Last week, her art collection and her mineral collection went up for sale in a single-owner auction at Sotheby’s.

The auction house confirmed to National Jeweler that all 126 minerals featured in “Fearless: The Collection of Hester Diamond Part II” sold. 

The mineral collection totaled $1.5 million, more than tripling its highest estimate of $358,450. Sotheby’s said 98 percent of the auction’s lots sold for more than expected.

The top lot was a Colombian emerald specimen from the Coscuez mine in Boyacá (seen at the top of the article). 

It was estimated to sell for between $3000 and $5,000, but ended up garnering $81,900 at the auction. 

An azurite with malachite from the Bisbee Mine in Arizona, sold for $52,920, compared with a pre-sale high of $12,000; an anhydrite from Mexico garnered $50,400, compared with a $600-$800 pre-sale range; and a rhodochrosite from the storied Sweet Home Mine in Colorado estimated to sell for $8,000-$12,000 ended up going for $44,100.

According to a Sotheby’s spokesperson, there was also a “great depth of bidding” throughout the sale, with many lots pursued by multiple bidders.

A pyrite specimen from Spain, for example, had 16 bidders going after it, and 16 were also going for a hemimorphite specimen from China, while 15 chased after quartz from Arkansas.

Visit Sothebys.com to see all results. 

Part 1 of the Hester Diamond auction, which featured a selection of Old Master paintings and sculpture as well as modernist works of art, totaled $26.8 million

The top lot was a rare sculpture by Gian Lorenzo Bernini and his father, called “Autumn,” which sold for $8.9 million. 
Brecken Branstratoris the senior editor, gemstones at National Jeweler, covering sourcing, pricing and other developments in the colored stone sector.

The Latest

Deutsch & Deutsch jewelers team
MajorsJan 23, 2026
Watches of Switzerland Acquires 4-Store Jewelry Chain in Texas

Family-owned jewelry and watch retailer Deutsch & Deutsch has stores in El Paso, Laredo, McAllen, and Victoria.

Baume & Mercier Riviera 10812 pink watch
WatchesJan 23, 2026
Damiani Group to Acquire Baume & Mercier

The Italian luxury company purchased the nearly 200-year-old Swiss watch brand from Richemont.

Martin Katz snowflake earrings
TrendsJan 23, 2026
Martin Katz’s Earrings Call to Mind Wintry Weather

Micro-set with hundreds of diamonds, these snowflake earrings recreate “winter’s most elegant silhouette,” and are our Piece of the Week.

JamAlert 1872x1052.png
Brought to you by
How Jewelers Can Fight Back Against Cell Jammers

Criminals are using cell jammers to disable alarms, but new technology like JamAlert™ can stop them.

Ella Blum
MajorsJan 23, 2026
Rembrandt Charms Names New Director of Creative, Brand Strategy

Ella Blum was appointed to the newly created role.

Weekly QuizJan 22, 2026
This Week’s Quiz
Test your jewelry news knowledge by answering these questions.
Take the Quiz
National-Jeweler_1872x1502_B copy.png
Supplier BulletinJan 22, 2026
The Rise of Centralized Sourcing in the Colored Gemstone Market

Sponsored by RapNet

Lugano Diamonds Greenwich Connecticut store
MajorsJan 22, 2026
Lugano Diamonds Finds a Buyer

Investment firm Enhanced Retail Funding, a division of Gordon Brothers, was the successful bidder.

Recipients Collage 2025 - NJ (1872 x 1050 px) (1872 x 1052 px).png
Brought to you by
Impacting Tomorrow Today

How Jewelers of America’s 20 Under 40 are leading to ensure a brighter future for the jewelry industry.

A Diamond Is Forever book
SourcingJan 22, 2026
De Beers To Release ‘A Diamond Is Forever’ Book

It explores the history of the iconic tagline and the company’s strategy to redefine the role of diamonds in society.

Sindhu Culas
MajorsJan 22, 2026
Swarovski Appoints New North America President

Retail veteran Sindhu Culas has stepped into the role.

Taylor Burgess
MajorsJan 22, 2026
Stuller Names New Chief Merchandising, Marketing, Sales Officer

Taylor Burgess, who has been at Stuller since 2013, was promoted to the newly created role.

My Next Question podcast with Sherry Smith and Edahn Golan
PodcastsJan 21, 2026
Episode 1: High Gold Prices, the Diamond Dilemma, & What’s Next

Was 2025 a good year for jewelers? Did lab-grown diamonds outsell natural? Find out on the first episode of the “My Next Question” podcast.

Jules Kim of Bijules, Sophie Howard of By Pariah, Jade Ruzzo, Joy Haugaard of Lionheart, Vanessa Fernández of Vanessa Fernández Studio, Hiba Husayni of Zahn-Z
EditorsJan 21, 2026
6 Jewelry Designers Poised to Have a Breakout Year in 2026

Whether you recognize their jewels or are just discovering them now, these designers’ talent and vision make them ones to watch this year.

Columbia Gem House celestial shapes
SourcingJan 21, 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.

Gavel and books stock image
CrimeJan 21, 2026
4 Men Charged in $1.7M California Smash-and-Grab Jewelry Store Robbery

Plus, JSA’s Scott Guginsky discusses the need for jewelers to take more precautions as the gold price continues to climb.

Felice Korr Morris
IndependentsJan 21, 2026
Delaware Jeweler Felice Morris Dies at 91

Morris’ most cherished role was being a mother and grandmother, her family said.

Bulgari Vimini Collection Campaign
CollectionsJan 21, 2026
Bulgari Weaves New Collection of ‘Vimini’ Creations

“Vimini” is the first chapter of the “Bulgari Eternal” collection that merges archival pieces with modern creations.

The Ritz-Carlton Half Moon Bay California
Events & AwardsJan 21, 2026
Jewelers Mutual’s ‘Conversations’ Retreat Returns to Discuss AI

The third edition will be held in Half Moon Bay, California, in April.

Hiba Husayni, Jules Kim, Johnny Nelson, Dorian Webb, Lorraine West
Events & AwardsJan 20, 2026
These Are the 5 Finalists for the David Yurman Gem Awards Grant

The grant is in its first year and was created to recognize an exceptional fine jewelry designer whose star is on the rise.

Emmanuel Raheb, National Jeweler columnist and CEO of Smart Age Solutions
ColumnistsJan 20, 2026
First-Party Data Is the Most Valuable Asset Jewelers Have in 2026

Data built on trust, not tracking, will be key to success going forward, as the era of “borrowed attention” ends, Emmanuel Raheb writes.

Heath Yarges
MajorsJan 20, 2026
Borsheims Hires New Assistant Facilities Manager

Heath Yarges brings two decades of experience to the role.

Peter Yantzer at a diamond cutting machine
EditorsJan 16, 2026
Remembering Pete Yantzer for His Contributions and His Kindness

Pete’s boundless curiosity extended beyond diamond cut and he was always eager to share his knowledge with others, no matter the topic.

Buccellati Opera Tulle ring
FinancialsJan 16, 2026
Richemont’s Jewelry Brands Shine in Q3

Cartier, Van Cleef & Arpels, Buccellati, and Vhernier had another successful holiday season, Richemont reported this week.

Lagos SML High Jewelry Bee Brooch
TrendsJan 16, 2026
Diane Lane's Brooch Buzzes at the 2026 Golden Globes

Our Piece of the Week is Lagos’ “Bee” brooch that was seen on the red carpet for the first time on Sunday.

Gavel
CrimeJan 15, 2026
D.C. Rapper ‘Taliban Glizzy’ Sentenced to 18+ Years for Jewelry Store Robberies

Trevor Jonathan Wright led a crew in a string of armed robberies targeting South Asian-owned jewelry stores on the East Coast.

Jewelers of America 20 Under 40 Program
Events & AwardsJan 15, 2026
Jewelers of Americas’ ‘20 Under 40’ Nominations Now Open

The program recognizes rising professionals in the jewelry industry.

The Venetian Expo Las Vegas
Events & AwardsJan 15, 2026
Registration for JCK Las Vegas 2026 Is Now Open

A new lifestyle section and a watch showcase have been added to this year’s event.

×

This site uses cookies to give you the best online experience. By continuing to use & browse this site, we assume you agree to our Privacy Policy