Cubic Zirconia - Fire Opal - Round

Cubic Zirconia - Fire Opal Rated AAA, our lab created cubic zirconias are beautiful as precious gemstones. Our high quality, calibrated CZs are precision cut and perfect for any setting, or to embed directly into metal clay. The Fire Opal CZ features deep color saturation and brilliance that catch the eye. Available in a variety of shapes, sizes and colors, get the sparkle and shine of precious gemstones with these beautiful, affordable stones. Open fire or carbon fire at 1560°F / 20 min. May be fired up to 2 hours at 1650°F, but color will fade slightly. Hardness: Cubic zirconia has a rating of approximately 8.5 on Mohs hardness scale vs. a rating of 10 for diamond. Click here for our Gemstone Firing Guide, a comprehensive list of gemstones, firing times and temperatures each can withstand.   Ring shown was created by Alexander Kraft using Cool Tools Cubic Zirconia and EZ960® Sterling Silver Clay. Stones include: Champagne Barrel Checkerboard, Amethyst Cushion Checkerboard and White Diamond Cushion Checkerboard.