GradingApr 19, 2021
Here’s What SSEF Found When It Studied High-Quality Afghan Emeralds SourcingNov 18, 2021
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.
Geochemists at the University of Nevada, Las Vegas discovered a new mineral that was carried to Earth’s surface in this diamond. (Photo credit: Aaron Celestian, Los Angeles County Natural History Museum)
Las Vegas—Inclusions are important not only in the study of their host gemstones but also for other scientific disciplines, and one recent discovery shows how much scientists rely on these imperfections to further their understanding.
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.
Related stories will be right here …
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.
Editors' Picks
Sponsored by
More on Sourcing
The Latest
IndependentsJun 05, 2026
Pennsylvania Jewelry Store To Close After 79 YearsJim Springer, owner of Dunkelberger’s Fine Jewelry, is heading into retirement.
SurveysJun 05, 2026
Consumers to Cut Back on Spending Amid Rising Prices, Survey Shows When conducting its May consumer confidence survey, The Conference Board asked extra questions about consumers’ budgeting strategies.
CollectionsJun 05, 2026
Rebel Jewelry’s Charm Symbolizes Perseverance for Pride MonthThe “Tunnel” charm, our Piece of the Week, celebrates Pride Month with its design inspired by hope and the light at the end of the tunnel.
Brought to you by
All Eyes on Gold Prices. Alternatives to Look For. And What to BEWARE of in VegasAs gold prices rise, today’s retailers are looking for alternatives at prices that will appeal to wider audiences.
AuctionsJun 04, 2026
Treasures from Maurice Tempelsman’s ‘Marvelous’ Life Head to AuctionUp for auction at Sotheby’s, the collection of Tempelsman’s personal effects includes a Cartier Tank watch Jackie O. gifted him.
Weekly QuizJun 05, 2026
This Week’s QuizTest your jewelry news knowledge by answering these questions.
CollectionsJun 04, 2026
Buddha Mama to Spend the Summer in AspenThe Miami-based fine jewelry brand will host its first summer residency in the Colorado mountain town from June 5 to Aug. 23.
MajorsJun 04, 2026
AGS Honors Late Peter Yantzer, Holds Time Capsule CeremonyThe organization also announced its international board of directors for the 2026-2027 term.
Brought to you by
How Modern Training Is Becoming a Competitive Advantage for Jewelry RetailersWith the trade and customer trust in mind, GIA® developed NextGem™ – on-demand training designed specifically for retail.
MajorsJun 04, 2026
Neiman Marcus’ Downtown Dallas Store to Close in SeptemberSaks Global confirmed the closure this week, spelling the end for a store that’s been part of downtown Dallas for more than 100 years.
ColumnistsJun 03, 2026
Peter Smith: When Top Talent Leaves and What It Says About YouSmith discusses how managers should handle a top performer's exit, warning that a poor response could have a lasting impact.
GradingJun 03, 2026
GIA’s Tracr Investment Is First Step Toward Industry-Owned PlatformThe Gemological Institute of America is now a 30 percent stakeholder in Tracr, the De Beers-backed blockchain for diamonds.
WatchesJun 03, 2026
The 1916 Company Taking Pre-Owned Rolexes on the Road, AgainThe retailer is bringing Rolex Certified Pre-Owned watches to five U.S. cities in 2026 for collectors to see, try on, and purchase.
IndependentsJun 03, 2026
Jessica Alba Is the New Face of Gabriel & Co.The actress and entrepreneur stars in the jeweler’s new campaign that celebrates life’s quiet moments.
TrendsJun 03, 2026
State of Design: Only the Innovative Will SurviveThe price of gold has risen, affecting the number of pieces designers make, the materials they use, and how they position themselves.
FinancialsJun 02, 2026
Signet Jewelers’ Q1 Sales Up 2% As It Focuses on ‘Core Four’ The jewelry retailer is zeroing in on Zales, Jared, Kay Jewelers, and Blue Nile as it looks to create unique brand identities for each.
WatchesJun 02, 2026
Watch Industry Veteran James Marks Joins Sotheby’sSotheby’s has appointed the former Phillips executive as its global head of private sales and retail in its watches division.
AuctionsJun 02, 2026
Sotheby’s to Auction 10-Carat Blue Diamond, 1960s Harry Winston Necklace A private collection of five Paraíba tourmalines also will be up for sale at Sotheby’s High Jewelry auction in New York, scheduled for June 16.
IndependentsJun 02, 2026
State of Retail: 6 Things Retailers Should Know About Consumers TodayFrom Gen Z’s view of luxury to “doom spending,” these are the six consumer trends to note this year.
Events & AwardsJun 01, 2026
Design Atelier Brands Have a Big Night at Emotional Couture Design AwardsThe show started by honoring Mildred Marcano, ended with a tearful Beth Anne Bonanno, and recognized a dozen-plus designers in between.
SourcingJun 01, 2026
RapNet Rebranding as Rapaport TradeThe revamped online diamond marketplace will feature pricing intelligence and data-driven tools for more efficient buying and selling.
SourcingJun 01, 2026
Gemfields’ Higher-Quality Emerald Auction Achieves $26.8MThe miner said demand for higher-quality emeralds is stable, but there is notable caution in the market.
CollectionsMay 29, 2026
Cultus Artem’s Necklace Is the Oasis in Las Vegas’ DesertThe “River of Heaven” necklace, our Piece of the Week debuting at Couture, combines 26 salt and pepper diamonds spaced by Tahitian pearls.
IndependentsMay 29, 2026
Meet the 2026 Retailer Hall of Fame InducteesThis year’s inductees include second-, third-, and fourth-generation jewelers.
Events & AwardsMay 28, 2026
JCK Announces Jesse Itzler as 2026 Keynote SpeakerThe author, speaker, and entrepreneur will give his presentation, “Spiritual Billionaire,” on Saturday morning.
Events & AwardsMay 28, 2026
JCK Rocks To Ride With NellyThree-time Grammy award-winning artist Nelly is set to perform at the annual event at Tao Beach on Sunday night.
MajorsMay 28, 2026
Signet Jewelers to Buy The Clear Cut Signet will integrate the online-only, natural diamond-focused jeweler into Blue Nile, which it wants to position as a higher-end retailer.
CollectionsMay 28, 2026
Meet The 17 Newcomers to Couture’s Design AtelierThese up-and-coming jewelry brands are bringing their distinct aesthetic and unique point-of-view to the Design Atelier for the first time.
