After the glass is ground to the correct shape, it is time for the polishing process to begin. I use a series of finer diamond grinding bits to make the edges smooth — from 60 to 200 grade.
Afterwards the ground edges are rubbed with a cerium oxide (CeO2) solution to increase the shine. Cerium oxide is commonly used as a glass polish.
Finally they go back into the kiln for what is known as a “fire polish”. During a fire polish is the glass is heated in the kiln to temperatures of 1300 degrees for a short period of time. The goal is to melt the glass just enough to give it a smooth, polished appearance.
See the results in the pictures below. You can see that the edges are now glossy and transparent:
Finally the bail is glued on and the pendant is complete!