White Opal:A white opal is a type of opal that is predominantly white in color. It is one of the most popular and valuable types of opal, due to its unique appearance. White opals typically have a milky white body color with colorful “play-of-color” effects. These colors can include red, orange, yellow, green, blue, and violet. White opals are found in a variety of locations around the world, including Australia, Brazil, Ethiopia, and the United States.