Zircon, Zirconia . Gems and precious stones . This site provides an integrated body of information about gems and gemstones.
Materials cover general topics central to gemmology, mineralogy, and geology.
Access also by alphabetical index . Learn why minerals have the colors they do. One of the high points of this page is the electronic library of gems and the gemstone inclusion library. Ask Professor Gem . Diamonds and Gemstones , and Myths and Misleading Gem Names .