Cubic Zirconia - Jet Black - Square

Cubic Zirconia - Jet Black 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 Jet Black CZ features deep dark color sure to 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. Stable at all metal clay temperatures. 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.