Chrysoprase

Chrysoprase is a valuable variety of chalcedony, prized more highly as a precious stone on the Continent than in this country. It is of a fine leek or apple-green colour in choice specimens, but inferior ones exhibit other shades of green, and it is sometimes spotted with yellowish-brown. It is often set in a circlet of diamonds or pearls. Unfortunately, it is apt to lose its colour through time, particularly if kept in a warm place.