Article Search Results

Show Filters
Showing 3 results for "*"
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.

Read More

The Natural Formation and Occurrence of Green Quartz

How amethyst under certain conditions may turn green rather than the expected citrine-yellow.

Read More

Artificially Induced Color in Amethyst-Citrine Quartz

A new and rather unusual gem material and possible treatments are discussed.

Read More