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Diamond octahedron, diamond bort, and carbonado
Carbonado Diamond: A Review of Properties and Origin

Presents a detailed examination of about 800 samples of carbonado diamond from Brazil and the Central African Republic, including possible models for its genesis.

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Article
Pyrope Garnet and Montana Sapphires Highlight Winter 2015 G&G

G&G Brief presents an overview of the content of the Winter 2015 issue of Gems & Gemology.

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Evan Smith studies images of diamond inclusions on a computer.
Article
Postdoctoral Program Gives Scientists Access to Rare Research Opportunities

GIA’s postdoctoral program gives researchers access to gemological data, equipment and rare, unusual and large gems in its laboratories.

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Chipped Diamond
Article
How to Protect Your Diamond from Chipping

Learn more about what causes a diamond to chip, and 8 tips on how you can avoid chipping your diamond.

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Indian necklace
Article
Jewelers to the Maharajas of Jaipur and Modern-Day Moguls

Enter a world not well-known in the West—the world of the maharajas and their jewelry, coveted by the modern-day moguls of business, entertainment, and royalty. See the fantastic works of art made today in the form of enameled Kundan meena jewelry and the regal look of polki diamonds.

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The Wittelsbach-Graff and Hope Diamonds: Not Cut from the Same Rough

Two historic blue diamonds, the Hope and the Wittelsbach-Graff, appeared together for the first time at the Smithsonian Institution in 2010.

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DiamondView Imaging of the Pavilion Facets
Pseudo-Synthetic Growth Structure Observed in Natural Diamond

This stone was a good example of a very rare natural diamond exhibiting synthetic growth characteristics.

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Gem-Quality Synthetic Diamonds Grown by a Chemical Vapor Deposition (CVD) Method

Brown-to-gray and near-colorless single-crystal type IIa synthetic diamonds grown.

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An Update on Sumitomo Gem-Quality Synthetic Diamonds

Both crystal morphology and size can greatly affect the properties observed in a synthetic diamond.

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Recent Discoveries of Large Diamonds in Trinity County, California

In the early 1980s four diamonds were recovered from stream gravels of Hayfork Creek in Trinity County, California; all four are of industrial grade and all have an interesting feature in common.

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