This is a fine tiny Australian Opal doublet . Multi-Color , Green-Violet-Blue-Red-Orange-Yellow Flashing; Good Quality; about 8mm long, 4mm wide, and 2mm thick ; tiny small size see image with ruler; doublets are a traditional composite gemstone that maximizes the beauty of thin vein high flash Australian opals and suitable for fine jewelry; item shipped will vary slightly; 1 specified buys 1 opal, 2 buys 2 opals, etc.