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Gerd Dreher agate lily and Patrick Dreher citrine mouse
Gem Virtuosos: The Drehers and Their Extraordinary Carvings

A look at the artistic heritage of the Drehers, an influential family of gem carvers in Idar-Oberstein, Germany.

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10 Tips for Buying a Diamond Online

Looking to buy a diamond online? We have 10 tips to help you click the “Buy Now” button with confidence.

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Diamond Buying Tips

You can buy a diamond with confidence when you follow these tips.

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Tanzanite
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Tanzanite Quality Factors

Learn about the factors that make tanzanite so desirable.

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Sapphire
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Sapphire Quality Factors

Learn about the factors that make sapphire so desirable.

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Montana sapphires after two rounds of heating
Big Sky Country Sapphire: Visiting Montana’s Alluvial Deposits

Documents a visit to the upper Missouri River and Rock Creek sapphire mining areas.

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Various colors of nephrite
Characterization of Mg and Fe Contents in Nephrite Using Raman Spectroscopy

Evaluates the usefulness of Raman spectroscopy in distinguishing the color varieties of nephrite based on the relative ratio of Mg to Fe concentration.

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Famous Diamonds Examined by GIA

An aura of mystery has always surrounded these natural wonders, so it was quite an honor when GIA researchers examined these famous diamonds.

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Fancy Color Diamond
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Fancy Color Diamond Quality Factors

Learn about the factors that make fancy color diamonds so desirable.

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Diamond
Article
Diamond Quality Factors

Learn about the factors that make diamonds so desirable.

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