An individual stone, either natural corundum, lab grown corundum, or cubic zirconia. Push them into the wet clay, and fire with the stone in place. Beautiful stones - they are top quality cut.
All of our kiln safe stones are test fired up to 800°C
I love the rich yellow colour of this gem and they fire really well in the fine silver clay. I normally fire them for thirty minutes and they come out the same way they went in. Service as always with Metal Clay Ltd is excellent.