Chrysoprase, chrysophrase or chrysoprasus is a gemstone variety of chalcedony (a cryptocrystalline form of silica) that contains small quantities of nickel. Its color is normally apple-green, but varies to deep green. The darker varieties of chrysoprase are also referred to as prase.The name is derived from the Greek words “chrysos prason”, meaning “gold leek”. As you can imagine, the gem is a bright leek green translucent gemstone. Its shades vary from very pale green through to a “Golden Delicious” apple green.