Chapter 4. Classification and properties

Chrysoberyl is the third hardest naturally occurring gemstone and lies between corundum and topaz on the hardness scale. Only corundum and diamond are harder and chrysoberyl is well known for its toughness and durability. Rubbing chrysoberyl will produce a static charge that is retained for several hours. Chrysoberyl is a mineral consisting of ordinary colorless or yellow transparent chrysoberyl, cymophane (chrysoberyl cat´s eye), and alexandrite.