A gem, such as an opal, that has commercial value but is not as rare or expensive as a precious stone.
A glassy, very hard mineral, silicon dioxide, SiO2, found in a variety of forms, including quartz, opal, chalcedony, sand, or chert
A costly ornament of precious metal or gems.
Anything prized for its beauty and value, esp. if small and perfect of its kind
Find another word for opal. In this page you can discover 8 synonyms, antonyms, idiomatic expressions, and related words for opal, like: semiprecious stone, silica, jewel, cobalt, gem, sapphire, indigo and opaline.