A real pretty genuine opal doublet set in a handmade ring of 14k gold fill with sterling silver twisted wire center The opal is .8 ct and measures 8 x 6 It is milky white with a lot of blue, green and red flash A real nice opal doubletl at a great price! The ring is size 6 1/4 comes with black velvet gift box An opal doublet is a slice of precious opal glued to a black backing. This technique is used frequently with rare opal to produce larger and stronger pieces at a lower cost. The black backing, usually made of vitriolite or common opal, also causes the color of the opal to become darker and more vibrant.