Imitation Peacock Opal Gemstone - Cabochon Oval

Imitation Peacock Opal Gemstone Our lab created gemstones are as beautiful as natural stones. These high quality stones are precision cut and perfect for any setting, or to embed directly into metal clay. Available in a variety of shapes, sizes and colors, get the sparkle and shine of natural stones with these beautiful, affordable gemstones. Click here for our Gemstone Firing Guide, a comprehensive list of gemstones, firing times and the temperatures each can withstand. Lab created gemstones are more affordable than natural stones, and unlike natural stones, they have no flaws. No Fire: Set after firing. Hardness: Imitation Opal has a rating of approximately 5.5 on Mohs hardness scale. Thickness: LAB-249: 2.8mm. LAB-250: 2.2mm.