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.
Gems and Minerals from the Subarctic
Circumnavigate the boreal reaches of the globe to explore gems from polar regions.
Gemstone Durability: Design to Display
A treatise on the design, display, care and repair of fine gemstones.
Irradiated Topaz and Radioactivity
Large quantities of colorless topaz are currently being treated by gamma irradiation to turn them blue.