AGATE: Applied to chalcedony that is translucent or semi-translucent. Chalcedony is more specifically seen with curved or angular bands. Often colorless versions are dyed red, green, black yellow or blue. Agate is mainly found in Mexico, Brazil, Namibia, Madagascar, Russia and India.

BLOODSTONE: An opaque chalcedony that is usually dark green, almost black. It is distinguished by its orange or red spots. It was once used for medicinal purposes to stop bleeding. The main source for bloodstone is India. Bloodstone was often used in early Victorian jewelry.

CARNELIAN AGATE: Clear orange or red chalcedony. Most all is heat treated. Found in South Africa, China, Brazil, Morocco, and Uruguay.

CHALCEDONY: White, gray or light gray stone.

BLUE CHALCODONY: Blue stone generally from Namibia

CHRYSOPRASE: Pale to medium green stone, looks like jade. Found in Australia, Zimbabwe, Brazil, Poland and Kazakhstan. The most rare and valuable variety.

JASPER: An opaque, fine-grained stone. Jasper is distinguished from other forms of chalcedony by the fine sugar-like grains it has. Normally it is multi-colored by foreign materials. It is usually spotted or striped. Most common colors are yellow, green, brown or gray. Jasper is found worldwide. Found often in Venezuela, Germany and Russia.

ONYX: Parallel bands that are black and white, which is rare. Black onyx is usually a dyed chalcedony