Search Results for: Semi-precious stone
basic types of opal: precious opal - common opal - fire opal precious opal: several examples of precious opal. clockwise from top left: pinfire opal, white opal, matrix opal, boulder opal, harlequin opal, black opal. precious opal "precious opal" flashes iridescent colors when it is viewed from different
angles, when the stone is moved, or when the light source is moved. this phenomenon is known as a "play-of-color." precious opal can flash a number of colors such as bright yellow, orange, green, blue, red or purple. play-of-color is what makes opal a popular gem. the desirability of precious opal is...
https://geology.com/gemstones/opal/