GIA'S GÜBELIN GEM PROJECT

GIA studied more than 400 important gemstones from the Gübelin Collection and is committed to sharing this repository of gemological information. This

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GIA's Gübelin Gem Project: Tourmaline FacebookTwitterPrintEm

Tourmalines Photo by Robert Weldon/GIA, courtesy Dr. E. J. Gbelin Collection GIA Collection 33673, 34233, 34234, 34237, 34239 Tourmalines have a very complex chemical composition, and more than a dozen...

GIA's Gübelin Gem Project: Tourmaline

Tourmalines Photo by Robert Weldon/GIA, courtesy Dr. E. J. Gbelin Collection GIA Collection 33673, 34233, 34234, 34237, 34239 Tourmalines have a very complex chemical composition, and more than a dozen...

GIA's Gübelin Gem Project: Spinel

Spinels Photo by Robert Weldon/GIA, courtesy Dr. E. J. Gbelin Collection GIA Collection 34618, 34661, 34662, 34908 Found in nearly every color most notably red, pink and blue spinels are popular gemsto...

GIA's Gübelin Gem Project: Garnet

Photo by Robert Weldon/GIA Often thought of as a deep red gemstone, garnet can also be yellow, orange, green or brown any color except blue. There are six common garnet minerals almandine, andradite, g...

GIA Gem Project Corundum

Corundums (ruby and sapphires) occur in all colors of the spectrum, and have remained popular gemstones from ancient times to the present day. Photo by Robert Weldon/GIA Ruby and sapphire (usually blue...