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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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Optimizing Face-Up Appearance in Colored Gemstone Faceting

How contrast patterns can increase perceived brightness and optimize a gemstone's appearance.

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The increasing popularity of cultured pearls with unusual color and size combinations
Cultured Pearl Update

Fran Mastoloni shares his thoughts on the status of the cultured pearl market.

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Red beryl from Utah found on the secondary market
Finds from the Secondary Market

Dave Bindra shows some noteworthy pieces he obtained on the secondary market and shares his thoughts on the state of the colored stones market.

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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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