Scientists Found This New Deep-Earth Mineral Trapped in a Diamond
Davemaoite isn’t found in nature because it can’t survive outside the high-pressure environment of Earth’s mantle.

The University of Nevada, Las Vegas said in a statement that its geochemists recently discovered a mineral never observed in nature thanks to a diamond that carried it to the surface.
The mineral—a calcium silicate perovskite dubbed “davemaoite”—was found trapped in a diamond and traveled up to the Earth’s surface from at least 410 miles deep in the lower mantle, located between the planet’s core and crust.
The mineral was theorized to exist but hadn’t ever been observed before since many lower-mantle minerals can only exist in a high-pressure environment; they “fall apart” before reaching the surface, UNLV said.
The strength of its host diamond—a greenish, octahedral-shaped stone—allowed the davemaoite to survive and make it to the top, where UNLV’s geochemists could study it.
UNLV mineralogist Oliver Tschauner, who studies “super-deep diamonds” to see what they can teach us about the Earth’s interior and led the study published in Science this month, believes davemaoite formed between 410 and 560 miles below the Earth’s surface.
The recently discovered specimen appears as “infinitesimal small dark specks” in the diamond, where it was secure.
But, “When we broke open the diamond, the [mineral] stayed intact for about a second, then we saw it expand and bulge under the microscope and basically turn into glass,” Tschauner is quoted as saying in New Scientist.
The inclusions are only 5-10 micron in diameter, so Tschauner and his team analyzed its interior using X-ray fluorescence spectroscopy, X-ray diffraction, and infrared transmission spectrometry, finishing with laser-ablation ICP-mass spectrometry (LA-ICP-MS) for a full chemical analysis.
He said the material analyzed by LA-ICP-MS is gone, but added they scanned the sample by micro-X-ray diffraction afterward and found a weak signal of davemaoite, thereby noting there was still some material left inside.
The diamond was recovered from Botswana’s Orapa mine in the 1980s. The specimen was originally part of the California Institute of Technology mineral collection, which acquired it from a diamond dealer in 1987.
Davemaoite is one of three main minerals in Earth’s lower mantle and makes up about 5-7 percent of the material there, Tschauner told Nature. Importantly, it can host three of the major elements that affect heat production in Earth’s lower mantle.
The International Mineralogical Association (IMA) has officially approved davemaoite as a new natural mineral.
It was named in honor of Ho-Kwang “Dave” Mao, an experimental geophysicist who created many of the techniques still used by scientists like Tschauner and his colleagues today.
The specimen studied by UNLV is now in the collection of the Los Angeles County Natural History Museum.
The Latest

The Kruse GWS Auctions sale will include the replica “Taj Mahal” necklace Elizabeth Taylor made with Avon as well as a costume piece Marilyn Monroe wore.

Massimo Basei is moving up, while Chief Commercial Officer Martino Pessina is stepping down.

AGTA GemFair and the Denver Gem & Mineral Show also will have a presence on the show floor.

Distinguishing natural diamonds from laboratory-grown stones – now more available than ever – has been difficult for jewelers. Until now.

Sold by Christie’s Hong Kong, this masterwork of complications now holds the record for most expensive watch ever auctioned online.


The watch company expects first-quarter sales to fall as much as 15 percent due to inflation and tough comps.

Adam O’Grady, general manager of the Lightbox Lab, has taken on the new role and will report directly to Lightbox CEO Antoine Borde.

De Beers Institute of Diamonds provides the very best in diamond verification, education and diamond services.

The watch marketplace gathered data from 1.3 million collectors, highlighting the most popular timepieces and exploring value appreciation.

Patented and specialty cuts now can receive an 8X Proprietary Certificate, which can be customized to include a company’s brand and logo.

The organization said it will recognize those who exemplify the idea that doing good is good business.

Kendall Jenner once again is fronting the French brand’s campaign, joined by model and dancer Alton Mason.

The CEOs of Signet, Helzberg, and GIA spoke on a water conservation panel, and had lakes named in their companies’ honor.

Sales of the sleek sterling silver and diamond design will go to nonprofit organization charity: water.

Expected to earn up to $4.5 million, the “Jarretière” bracelet is the star of Christie’s “The Magnificent Jewels of Anne Eisenhower” sale.

With jewelry sales coming down from their pandemic highs, retailers need to do all they can to retain existing customers, Peter Smith says.

Jewelry historians, authors, and experts will explore the works of Tiffany & Co., Oscar Heyman, Verdura, and more.

Johnson joined the retailer in 1987, establishing its first human resources department.

Supplier Spotlight Presented by IGI

The industry gathered to celebrate those who elevate the jewelry and watch industries.

At JSA’s annual luncheon, President John J. Kennedy said the organization recorded more than 2,000 cases last year.

It highlights Gabrielle “Coco” Chanel’s lasting influence on modern design.

Jewelers of America’s Amanda Gizzi explores the qualities and accomplishments that make this year’s Gem Award nominees shine.

Here’s what the nine chosen organizations plan to do with the funds.

The designer is nominated for a Gem Award for Jewelry Design.

The jewelry giant’s full-year sales were essentially flat, brought down by fourth-quarter declines.

In its recent results, the company highlighted non-bridal jewelry sales and said its “inventory-light” showroom model may change.