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HOC synthetic alexandrite inclusion.
Challenges in Orienting Alexandrite: The Usambara and Other Optical Effects in Synthetic HOC-Grown Russian Alexandrite

Overview and commentary on the 2013 Journal of Gemmology article “Synthetic alexandrites grown by the HOC method in Russia: Internal features related to the growth technique and colorimetric investigation.”

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Titanium-Bearing Synthetic Alexandrite and Chrysoberyl

Overview and commentary on the 2013 Journal of Gemmology article “Titanium-Bearing Synthetic Alexandrite and Chrysoberyl.”

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Baltic Amber map
Article
Historical Reading List: 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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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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Article
GIA Gem Project
Various Gems (Taaffeite - Zoisite)

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

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Article
GIA Gem Project
Various Gems
(Sapphirine - Stibiotantalite)

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

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Article
GIA Gem Project
Various Gems (Olivine - Rutile)

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

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Article
GIA Gem Project
Various Gems
(Kornerupine - Natrolite)

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

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Article
GIA Gem Project
Various Gems
(Danburite – Humite)

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

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Article
GIA Gem Project
Various Gems (Barite - Cuprite)

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

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