The cubic zirconia and lab grown stones are perfect for PMC or Art Clay (all types) fire in place. They are also excellent for applications in fused and lampwork glass beads. Used extensively for over 9 years in PMC classes and after thousands of sales, we haven't experienced any cracking, melting, etc. We have customers that rave about the clarity and color of our stones compared to others available on the market.
These prices are amazing...and it matches the quality! We've recently expanded our line of stones, more than doubling our old selection. All the cubic ziconia and lab stones we carry can be fired to the full 1650F temperature! The Frits have different temperatures that will effect their final colors.
The stones are round unless otherwise noted (marquise, trillion, square, etc). The number in the package is denoted in parenthesis (). Most have 2 or 4, but if there are no parenthesis, then this is the price per stone.
Please remember: do not quench your stones in water!
NOTE: Follow the industry stone charts to see what natural stones can be fired. Some of them can and some cannot. There is no difference in composition from one particular stone to another (sunstone to sunstone, etc), however, the stone can crack due to inclusions. There is no guarantee as to whether a stone will survive firing based on inclusions. Things can happen during firing. However, sapphires, rhodolite, garnets can be fired to 1650F. Other stones like moonstone and sunstone can be fired to certain temperatures. Again, consult the industry charts.
Stone Firing Temperatures: http://www.pmc-conference.com/archives/seminars/gemstonechart.html