Bursting with beauty, Opal dazzles with it's kaleidoscopic play-of-color caused by Hydrated Silica. Found predominately in Australia, Mexico, Brazil, Southern Africa and the Czech Republic; opal is the world’s most popular phenomenal stone with its ability to display the entire color spectrum in one stone. These flashes of color are known as play-of-color. The play-of-color is caused by the way the structure, a regular arrangement of tiny silica spheres, diffracts light. The four main types of opal are White Opal, Black Opal, Fire Opal, and Boulder Opal. Black opal is the most rare & scarce and can only be found in Australia.