Utilized by both Greeks and Romans like a decorative stone, chrysoprase, a translucent, apple-green stone, is easily the most valued number of chalcedony. The color, based on the existence of nickel, may fade in sunlight and stones will then be mistaken with fine jade.
Mines in Poland and Czechoslovakia once produced very fine chrysoprase. However, since 1965 the highest quality material originates from Queensland (Australia). Other localities would be the Urals (Russia), California (USA), Brazil and Austria.
Another green chalcedony, prase, includes a more sombre hue and it is unusual.
