Precious Stone Emerald
Emerald is a green variety of the mineral beryl. Other gemstone color variety that normally belongs to beryl includes aquamarine, Morganite, and heliodor. Other colors of beryl are simply referred as to by their color, such as red beryl.
The wonderful green color of emerald is unparalleled in the gem history. Emerald's precious green color is caused by its small amounts of chromium and enhanced by traces of iron. Unlike other beryl’s, emeralds are often contain inclusions and other flaws. These flaws are not looked on as negative aspects for emerald like that they would be for other gemstones. Indeed, these flaws are considered as part of its character of the stone and are used to assure the purchaser of a natural stone.
Historical Facts of Emerald
Refractive Index: 1.577(+-.016), 1.583 (+-.017)
Chemical Composition: Be3Al2(SiO3)6
Crystal Group: Hexagonal
Density: 2.72 (-.05, +.12)
Sign of the Zodiac: Taurus
Month of the year: May
Color information: Blue, Green Blue
Occurence: Brazil, Pakistan, Russia, East Africa, Madagascar, India, Columbia