Phenomenal Gemstones are gemstones which display any optical phenomena such as chatoyancy, asterism, change of color, play of color, adularescence, ...

Gemology: an Exploration into the World of Colored Stones; glimpses of a personal adventure into the world of gemology; around the world and under the lens.

Serious Crystals supplies high quality crystals and stones, and provides in-depth information about them, along with book reviews, discussion areas, resources ...