Opal rainbow 4mm round coin

Compatible with COE 33 / borosilicate glass

These coin opals are flat & polished on both sides and rounded & polished along the edges. The stones are 1mm thick and have a transparent base color. When encased the edges of the opals can disappear leaving only the fire floating in the glass - a very neat effect. Each stone flashes a rainbow of intense fire. You are going to love these opals!