Gomez’s jewelry included Tiffany & Co. drop-style earrings while Blanco stacked diamonds from Jacob & Co. on his wrist.
What Diamonds Tell Us About Deep Earth
The mineral, which is an allotrope of carbon, recently made the cover of “Science” magazine. Here’s why.

Diamonds--or rather, one very large diamond from the Lulo mine in Angola--recently made the cover of “Science” magazine thanks to breakthrough research led by a gentleman who is a postdoctoral research fellow at the Gemological Institute of America specializing in diamond geology.
Evan Smith led a team of researchers who studied inclusions in more than 50 Type IIa diamonds to uncover clues about Earth’s geology and back up a theory that geologists have been working with for more than a decade.
So, what was the theory and why is it important?
I recently had the chance to chat with the lead researcher, who started his postdoctoral work at the GIA in 2015, to find out.
First, though, a little bit of background on Mr. Smith so you can better understand how he came to be studying diamonds at the GIA.
He grew up in Canada and holds a bachelor’s degree in applied science and a master’s in engineering from Queen’s University in Kingston, Ontario.
One day when he was an undergraduate, one of his classes had a guest speaker who gave a lecture on “the wonder behind diamonds,” and what they tell us about the Earth.
After that, Smith said, he was hooked.
“You start to understand more and more the things that diamonds can tell us,” he said. “They’re really unique minerals. No other mineral really has this ability to document the Earth and play the role of such a storyteller.”
Smith earned his master’s at Queen’s and then went on to get his Ph.D. in geology from the University of British Columbia.
Today, he’s at the GIA in New York where his post-doctoral work focuses on systematically characterizing the inclusions seen in rare types of diamonds to help us better understand how diamonds form and what they mean for the evolution of the planet.
The article recently published in “Science” magazine detailed a study that Smith, along with other scientists including the GIA’s Wuyi Wang, did on the unique properties of Type IIa diamonds, stones that are similar to well-known diamonds like the Cullinan, the Koh-i-Noor and the more recently discovered 812.77-carat “Constellation.” The purpose behind the research was to better understand Earth’s mantle, which is beneath tectonic plates and, as such, largely inaccessible for scientific observation.
As you may already know, Type IIa diamonds
Smith also pointed out something that I had never thought about before but should have been obvious after years of writing articles about diamonds like this--that the big rough diamonds that make headlines tend to be irregular in shape, not a nice, symmetrical octahedron like so many smaller stones. They often have a surface that’s rounded and somewhat dissolved, “almost like a lollipop after someone’s been after it for a while,” Smith said.

The fact that these big, beautiful diamonds are different has not escaped the attention of earth scientists, who have wondered for years if they form in a different way, in a different part of Earth’s mantle, and thus tell us something different about our planet.
In order to conduct the study, though, Smith and the other researchers did not, and could not, limit themselves to these kind of outsized and exceedingly rare diamonds.
Instead, they studied Type IIa diamonds of all sizes that came through the GIA lab, including some that were smaller than a carat.
Particularly helpful in the study were chunks of diamonds that were cut off larger stones and picked up from the cutting room floor, so to speak.
These offcuts--many of which came from Letšeng in Lesotho, the same mine that produced the rough diamond cut to create the incredible 118.78-carat “Graff Venus”--were key to the study because the researchers could polish them to get a better look at the inclusions, something that they, obviously, could not do with the other diamonds.
“If we didn’t have the off-cuts,” Smith noted, “we might not be having this conversation.”
What Smith and the other researchers found after examining 52 Type IIa stones (and one Type Iab) is that in nearly three-quarters of the diamonds (38 out of 53), the inclusions weren’t, as long believed, graphite but metallic, a solidified mixture of iron, nickel, carbon and sulfur.
Smith said that this verifies what geologists have been theorizing for 10 or more years: that the Earth’s deeper mantle environment has a “light peppering” (up to 1 percent) of metallic iron.
This understanding is important because it changes the way scientists think about how different elements, like carbon, nitrogen and sulfur, are distributed. It also has broad implications for understanding the behavior of the deep Earth, including the recycling of surface rocks into the convecting mantle.
You can read a synopsis of Smith’s article on the “Science” website, though the full article is not available online for free to everyone.
In addition to Smith and Wang, the research team included Steven Shirey, Emma Bullock and Jianhua Wang from the Carnegie Institution for Sciences; Fabrizio Nestola from the Department of Geosciences at the University of Padova; and Stephen Richardson from the Department of Geological Sciences at the University of Cape Town in South Africa.
The Latest

Diamond industry banking veteran Paul De Wachter will take on the role in January 2026.

Taylor Swift flaunts an Elizabeth Taylor-esque gemstone in promo for her new album, “The Life of a Showgirl.”

Its “Quantre Sand” capsule was made using a 3D sand printing technique borrowed from the automotive and aeronautics industries.


Four individuals have been charged in the “takeover-style” robbery of Heller Jewelers last month, and additional charges are expected.

“Radiance and Reverie” will showcase more than 150 jewels from Lane’s personal collection by Tiffany & Co., Cartier, and more.

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

The month’s birthstones, tourmaline and opal, complement the palette of autumn.

Smith shares the importance of looking at your company with openness and honesty to identify opportunities you may be missing.

Respondents were concerned about job availability and rising prices.

Its latest interim financials revealed a challenging first half due in part to production troubles at its mines.

Alexander Lacik has led Pandora since 2019. Berta de Pablos-Barbier will succeed him, the first woman to head the company.

Two men allegedly used counterfeit bills to purchase luxury watches and jewelry from a North Carolina jeweler.

The “Lovestruck” collection, designed with the Academy and Grammy award-winning siblings, is the brand’s first lab-grown diamond offering.

The brand, celebrating its 15th anniversary, has popped up at Market, a luxury fashion destination in Highland Park Village.

She was remembered as a creative and generous woman of faith, who also had a sweet tooth.

Move over neck mess, the ear story is the way to make a layering statement today.

The New York-based brand is set to launch a limited-time offering for the holiday season at Holt Renfrew in Toronto.

The “Volume 7” bridal catalog features best-selling engagement rings, trending styles, and a new section highlighting anniversary bands.

Holiday sales growth is expected to slow as consumers grapple with inflation and tariff-related uncertainty.

Jamie Turner Designs is among the winners of the local “Austin Shines” contest, hosted by Eliza Page, a jewelry store in Austin, Texas.

The red and azure colorway is one of many fun enamel pairings offered, bringing whimsy to the classic style of a monogramed signet ring.

A trade deal with Switzerland seems probable, but reaching an agreement with India remains a challenge, David Bonaparte said.

Botswana’s president said his country wants a controlling share, while Angola envisions multiple countries holding minority stakes.

The manufacturer is adding 1,400 chemical vapor deposition (CVD) reactors to its growing facility in India.

The jeweler to the stars has worked with Drake, A$AP Rocky, Tyler the Creator, and other celebrities.