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featured Research & News

LAB NOTES

Multi-Elemental Diffused and Melt-Grown Synthetic Sapphire

GIA examines this material for the first time.
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GEM NEWS INTERNATIONAL

Exceptional Freeform Tanzanite and Oregon Sunstone Rings

A family sources, designs, and carves gems for extraordinary jewelry and pieces.
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MICRO-WORLD

Negative Crystals in Sapphires

Sapphires from Baw Mar host multiphase inclusions in appealing patterns.
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MICRO-WORLD

Quarterly Crystal: Mystery in Topaz

A topaz hosting a group of inclusions is examined in the Carlsbad lab.
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LAB NOTES

Paraíba Tourmaline with Unusual Coating

A coated Paraíba tourmaline is seen for the first time at a GIA lab.
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GEM NEWS INTERNATIONAL

Importance of the Secondary Market for Fine Gems

Exceptional gems that are recirculated in the gem market make an impact at the Tucson shows.
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Learn & Connect

This Month's

Featured Gems

  • Featured Gem Peridot
    Peridot
    emerald
    Peridot

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

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  • Fancy Color Diamond
    Fancy Color Diamond
    emerald
    Fancy Color Diamond

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

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  • Diamond
    Diamond
    emerald
    Diamond

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

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  • Emerald Bluish Green Stone
    Emerald
    emerald
    Emerald

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

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  • Featured Gem Citrine
    Citrine
    emerald
    Citrine

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

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View the Gem Encyclopedia

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