The Chrysoprase, like the Agate, is a variety of quartz and takes its name from two Greek words meaning "golden leek," in reference to its colour, which varies from an opaque yellowish green to a very light dirty white-green. The colour has a tendency to fade from long exposure to the light and sun, but can be restored if the stone is dipped in a solution of nitrate of nickel.
The finest specimens come from Silesia, and when the stone was in demand it used to be customary to close the mines for every two years out of three.
According to Albertus Magnus, a Chrysoprase formed the Amulet of Alexander the Great, and Chrysoprase was much used by the ancient Greeks and Romans for signet rings and cameos; and also by the Egyptians, who set it with lapis lazuli.
The virtues attributed to the Chrysoprase were that it imparted cheerfulness, making the heart glad by removing uneasiness, protecting its wearers from evil dreams and the assaults of demons.
It also bestowed all kinds of blessings on its owner, giving assiduity in good works, and taking away all greedy and covetous desires, bringing success in new enterprises, and true and faithful friends: and it was also worn as an Amulet against rheumatism and gout.