Chalcedony name has derived from the name of an ancient Greek town 'Chalkedon'. The variety of Chalcedony includes carnelian, sard, plasma, prase, bloodstone, onyx, sardonyx, chrysoprase, thundereggs, agate, flint, chert, jasper, petrified wood, Heliotrope, Mocha etc. Varieties of chalcedony show an amazing variety of colors and patterns. The Chalcedony is available in a range of colors like blue, white, buff, lighter shades of tan, grey, yellow or brown. These stones are usually semi transparent or translucent. All variety of Chalcedony stones are used both as gemstones as well as ornamental stones. Its durability, beauty, and abundance made chalcedony one of the earliest raw materials used by humans. This beautiful stone is believed to banish fear, hysteria, depression, mental illness and sadness and also reduces fever.