About Opal, Origins, Properties, What Causes Fire or Play of Light
Opal, A Fiery Muse One of the original “precious gemstones,” opals have been celebrated and coveted through the ages. For their lively light-play and rainbow colors, opal is unlike any other gemstone. One of four so-called phenomenal gemstones, they exhibit a unique light interaction called opalescence, created by perfectly ordered spheres of silica, which diffract light with a [...]