Chalcedony gem is a type of gemstone that is composed of microcrystalline quartz. It is often found in a variety of colors and can be cut into cabochons, beads, and other shapes. The crossword solutions for the term chalcedony gem include AGATE (5 letters), sard (4 letters), ONYX (4 letters), CARNELIAN (9 letters), OPAL (4 letters), IDAHO (5 letters), and JADE (4 letters). AGATE is a banded form of chalcedony that is usually found in shades of brown, red, or yellow. Sard is a reddish-brown variety of chalcedony that is often used in jewelry. ONYX is a black variety of chalcedony that is often used to make cameos. CARNELIAN is an orange-red variety of chalcedony that is often used in jewelry. OPAL is a milky white variety of chalcedony that is often used in jewelry. IDAHO is a blue-green variety of chalcedony that is found in the state of IDAHO. JADE is a green variety of chalcedony that is often used in jewelry.