Great for tube setting, sand casting, silver clay,  and stone in place setting bur metalsmithing techniques. 
Assorted small sizes and shapes.
how many? 30pcs
Color: Earth
For use is sand casting.
Heat resistant up to 900F
Cubic Zirconia (or CZ) is zirconium oxide (ZrO2 ), is widely synthesized for use as a diamond simulant and it is a lab made created stone with a specific gravity of between 5.6-6.00 and at about 7.5 hardness on Mohs scale, which is harder than most natural gems.
Its refractive index is high at 2.15 - 2.18 (B-G interval) and its luster is very good.
Its dispersion is very high at 0.058 - 0.066, exceeding that of diamond (0.044).
nd (0.044).