Iridescent Inclusion in Tanzanite
A tanzanite displayed crystallographically aligned, vividly iridescent colors resulting from fine separations along the stone’s cleavage planes.
For the first time, GIA's laboratory has examined tanzanite color-coated with titanium.
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.
Exceptional Freeform Tanzanite and Oregon Sunstone Rings
A family sources, designs, and carves gems for extraordinary jewelry and pieces.
Jaipur, India: The Global Gem and Jewelry Power of the Pink City
Examines Jaipur’s role as a colored stone cutting and jewelry manufacturing center, with profiles of 17 companies and their factory, trading, and retail operations.
Update on Colored Gemstone Mining in Tanzania
Reports on an expedition to many known and new Tanzanian gem localities.
Ginger Garnet, “Fancy” Tanzanite
Garnets and a wide variety of tanzanite at the Tucson gem shows.
High-End Colored Gems
A unique assortment of colored gemstones as seen at the GJX show in Tucson.
Pleochroism in Faceted Gems: An Introduction
Describes the phenomenon of pleochroism and its complex effect on the appearance of colored stones.
Merelaniite Inclusions in Tanzanite
A recently identified mineral is found, in whisker-like form, in a gem-quality tanzanite host.