These 4mm spheres are perfectly polished and ready to be set in glass. Like all our crystal opals, they have a clear transparent base with bright flashes of green and blue fire. Because of its transparency, the outline of the stone disappears in clear boro and flashes only the green and blue fire, creating a cool effect when you want to put the fire in the glass with less emphasis on the shape of the opal. As an added bonus, our crystal opals are the very best value for your buck in opal spheres.
Did you know our Gilson Created Opal does not decompose, off gas or release any substances when heated to very high temperatures? Read more about our testing here