Semiprecious stones are a type of gemstone that is valued for its beauty and rarity, but not as much as precious stones such as diamonds. AGATE (5 letters), JADE (4 letters), ONYX (4 letters), OPAL (4 letters), GARNET (6 letters), catseye (7 letters), and CARNELIAN (9 letters) are all examples of semiprecious stones. AGATE is a banded form of quartz, JADE is a mineral composed of sodium and aluminum, ONYX is a type of quartz with alternating black and white bands, OPAL is a hydrated amorphous form of silica, GARNET is a group of silicate minerals, catseye is a type of chrysoberyl, and CARNELIAN is a type of quartz.