These 8mm rainbow spheres are big, brilliant balls of bright rainbow fire in a transparent body. Like all of our rainbow opals, they have a clear transparent base and flash the colors of the rainbow with brilliant red, yellow, blue, and green fire. Because of its transparency, the outline of the stone disappears in clear boro (which is why some people call them "ghost opals") and flashes only the rainbow of opal fire in the middle of the glass. Rainbow opals are a good choice when you want to put the fire in the glass with less emphasis on the shape of the opal.
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