White opal, also called plainly "opal", is a unique gem with each one containing a unique display of colors and patterns. Because of its many colors, the Romans considered opal to be the most precious and powerful gemstone. Today white opal is primarily mined in Australia.

White opal set into a class ring makes for a very attractive centerpiece. Its hardness rating of 5 to 6.5 out of 10 means it should only be worn occasionally and proper care should be taken when wearing it.