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Diamond

Diamonds are among nature’s most precious and beautiful creations.

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CVD laboratory-grown diamond reaches a new record size at 16.41 ct.

New Record Size for CVD Laboratory-Grown Diamond

Wuyi Wang, Stephanie Persaud, and Elina Myagkaya, May 13, 2022

The New York laboratory reports on a new record size for CVD laboratory-grown diamond.

The Discovery of Davemaoite, the CaSiO₃ Perovskite, in a Diamond from Earth’s Lower Mantle

George R. Rossman and Oliver Tschauner, May 13, 2022

Davemaoite identified in a diamond from Orapa, Botswana.

Blue fluorescence and moderate blue-green phosphorescence seen with the DiamondView.

Natural Near-Colorless Type IIb Diamond

Ting Shui and Wenqing Huang, May 13, 2022

Rare boron-bearing natural diamond identified.

$Brownish orange hematite crystals concentrate along a fracture in diamond.$

Hematite Crystals in Diamond

Abadie Ludlam, Tingyen Yeh, and David Kondo, May 13, 2022

Tiny hematite crystal inclusions identified along two fractures in natural diamond.

Large type IIa diamonds ranging from 14 to 91 ct.

Deep-Focus Earthquakes: The Heartbeat of a Diamond Factory?

Evan M. Smith, May 13, 2022

The first installment of this column explores the potential role of modern-day deep-focus earthquakes on diamond growth.

The type IIb 15.10 ct De Beers Cullinan Blue diamond, graded by GIA.

Article

The Type IIb De Beers Cullinan Blue Diamond

Paul Johnson, A’Dhi Lall, Madelyn Dragone, and Stephanie Persaud, May 3, 2022

GIA’s New York laboratory reports on a 15.10 ct (17.47 × 11.53 × 7.94 mm) Fancy Vivid blue cut-cornered rectangular step cut named the De Beers Cullinan Blue diamond.

16.41 ct CVD laboratory-grown diamond achieves new record size.

Article

New Record Size for CVD Laboratory-Grown Diamond

Wuyi Wang, Stephanie Persaud, and Elina Myagkaya, January 27, 2022

GIA’s New York laboratory reports a new record size for CVD laboratory-grown diamond.

Measurement and Characterization of the Effects of Blue Fluorescence on Diamond Appearance

Yun Luo, David Nelson, Troy Ardon, and Christopher M. Breeding, September 3, 2021

Using customized, image-based measurement systems to quantify the effect of fluorescence on the color, brightness, and transparency of gem diamonds viewed in both face-up and table-down orientations.

What Have Diamond Ages Taught Us?

Karen V. Smit and Steven B. Shirey, April 5, 2021

Diamond ages offer insight into continent evolution spanning billions of years.

A fleur-de-lis motif tiara set with cushion-cut, pear-shaped, rose-cut, and round diamonds.

A History of European Royal Jewel Sales, Including Sotheby’s 2018 Auction of Marie Antoinette’s Jewels

Russell Shor, January 22, 2021

Chronicles important auctions of jewels from European royal collections over the years, with a focus on a recent high-profile sale of items that once belonged to Marie Antoinette.

This Month's

Featured Gems

Peridot

Found in lava, meteorites, and deep in the earth’s mantle, yellow-green peridot is the extreme gem.

Fancy Color Diamond

Dazzling brilliance. Captivating color. These are the planet’s most valued gems.

Diamond

Diamonds are among nature’s most precious and beautiful creations.

Emerald

Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine.

Citrine

Citrine is the transparent, pale yellow to brownish orange variety of quartz.

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Diamond

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Peridot

Fancy Color Diamond

Diamond

Emerald

Citrine

Diamond

Research

Reviewed

Topics

Topics

Gemstones

Gemstones

Featured Gems

Peridot

Fancy Color Diamond

Diamond

Emerald

Citrine

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