Chrysoprase is rarely of green color in natural occurrences. It is often covered with a brownish crush of ferric hydroxide, and is transformed intensively into a loose mass.
It is a wonderfully durable stone that resists chipping and cracking, so it can be worn everyday. The bright color can fade if exposed to heat and sunlight but can be restored with moist heat.
Chrysoprase, like the chalcedony and opal associated with it, contains 0.2-3.3 per cent nickel, 0.02 percent cobalt, 0.03 per cent chromium, 0.01 per cent zinc, 0.03 per cent copper; 0.3 per cent sodium and 0.3 per cent potassium.
Used as cabochons, for necklaces and for ornamental objects. In earlier centuries, it was used as a luxuries decorative stone for interior decoration, such as in Wenceslaus Chapel in Prague and in Sanssouchi Castle in Potsdam near Berlin.