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Non-nacreous Pen Pearls
Observations on Pearls Reportedly from the Pinnidae Family (Pen Pearls)

Examines the internal structure, chemical composition and spectroscopic features of 22 pen pearls.

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Article
GIA Gem Project
Various gems
(Amblygonite - Axinite)

Among the collection assembled by Dr Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

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

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

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Spinel 80909 300x169
Article
GIA Gem Project
Spinel

Found in nearly every colour – most notably red, pink and blue – spinels are popular gemstones because of their abundance, moderate cost and attractiveness.

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Garnet
Article
GIA Gem Project
Garnet

Often thought of as a deep red gemstone, garnet can also be yellow, orange, green or brown – any colour except blue.

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Article
GIA Gem Project
Beryl

Chemically pure beryl is colourless, but trace elements give rise to green, blue and pink/red colours.

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Baltic Amber map
Article
Historical Reading: Baltic Amber

Amber has been found in various parts of the world, but the main historical source is the land that surrounds the Baltic Sea.

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JAR butterfly brooch
Books: Jewels by JAR

A review of Jewels by JAR

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Gemstones of the World
Books: Gemstones of the World

Review of Walter Schumann's Gemstones of the World.

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Gem Identification Made Easy
Books: Gem Identification Made Easy

A review of the new edition of Gem Identification Made Easy by Antoinette Matlins

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