Michel Desalles allegedly murdered Omid Gholian inside World of Gold N Diamond using zip ties and then fled the country.
‘Oppenheimer Blue’ Diamond Could Sell For $45 Million
The rectangular-cut, 14.62-carat stone will be the largest and finest fancy vivid blue diamond ever offered at auction when it goes up for sale at Christie’s Geneva next month.

Geneva--When Christie’s holds its Magnificent Jewels sale in Geneva next month, it will offer the largest and finest fancy vivid blue diamond ever seen at auction.
The “Oppenheimer Blue,” a rectangular-cut, 14.62-carat stone, is expected to sell for between $38 million and $45 million when it hits the auction block in May.
This big blue diamond was owned by a man who certainly knew a thing or two about the stones.
Sir Philip Oppenheimer controlled the Diamond Syndicate in London and began working in the family business at De Beers London in 1934, where he sorted and valued diamonds.
Later, as head of the London-based Central Selling Organisation for more than 45 years and chairman of the Diamond Trading Company branch, he oversaw a diamond sales business set up by De Beers to control the global diamond supply.
Christie’s Magnificent Jewels sale is scheduled to take place at the Four Season Hotel des Bergues on May 18.
The sale also will include a collection of 46 pieces that once belonged to H.S.H Gabriela Princess zu Leiningen, estimated to realize more than $15 million total and featuring pieces from brands such as Cartier, Boucheron, Tiffany & Co. and Van Cleef & Arpels.
The Princess comes from a successful German entrepreneurial and philanthropic family. She was married to Prince Karl-Emich zu Leiningen for seven years and also was a qualified lawyer who became a consultant for UNESCO, advising on equality and women’s rights.
In May 1998, Princess Gabriela married His Highness Prince Karim Aga Khan IV, 49th Imam of the Ismaili community and international entrepreneur. During their 16-year marriage, the Princess held the title Begum Inaara Aga Khan and received a number of jewels from her-then husband to build upon her already large collection.
Click through she slideshow below to see six of the pieces belonging to the princess that will be up for auction.
The Latest

Associate Editor Lauren McLemore shares her favorite looks from a night of style inspired by Black dandyism.

Sponsored by Instappraise

Gain access to the most exclusive and coveted antique pieces from trusted dealers during Las Vegas Jewelry Week.

CEO Beth Gerstein discussed the company’s bridal bestsellers, the potential impact of tariffs, and the rising price of gold.


The brand’s first independent location outside of Australia has opened in Beverly Hills, California.

Cathy Marsh will lead the jewelry company’s efforts in the upper Midwest and western United States.

Supplier Spotlight Sponsored by GIA

The company has multiple strategies for dealing with tariffs, though its CEO said moving manufacturing to the U.S. is not one of them.

Connecting with your customers throughout the year is key to a successful holiday marketing push.

Its commercial-quality emerald sale held last month totaled more than $16 million, up from about $11 million in September 2024.

National Jeweler Editor-in-Chief Michelle Graff joined Michael Burpoe to talk tariffs, consumer confidence, and the sky-high price of gold.

Expanded this year to include suppliers, JA’s 2025 list honors 40 up-and-coming professionals in the jewelry industry.

Located in Fort Smith, it’s the Mid-South jeweler’s first store in Northwest Arkansas.

The episode about the family-owned jeweler will premiere May 17.

The Houston-based jeweler’s new 11,000-square-foot showroom will include a Rolex boutique.

“The Duke Diamond” is the largest diamond registered at the Arkansas park so far this year.

The childhood craft of making dried pasta necklaces for Mother’s Day is all grown up as the 14-karat gold “Forever Macaroni” necklace.

Set with May’s birthstone and featuring an earthworm, this ring is a perfect celebration of spring.

“Bridal 2025–2026” includes popular styles and a dedicated section for quick pricing references of lab-grown diamond bridal jewelry.

Though currently paused, high tariffs threaten many countries where gemstones are mined. Dealers are taking measures now to prepare.

Located in Miami’s Design District, the 4,000-square-foot store is an homage to David and Sybil Yurman’s artistic roots.

May babies are lucky indeed, born in a month awash with fresh colors and celebrated with one of the most coveted colored gemstones.

The deadline to apply for the Seymour & Evelyn Holtzman Bench Scholarship is June 12.

What’s really worrying U.S. consumers isn’t the present situation; it’s what the economy is going to look like six months from now.

Now called The Instore Jewelry Show, it will include holiday-focused education, interactive workshops, and a window display contest.

It includes pricing for unenhanced Colombian emeralds in the fine to extra fine range.