Australian "Black" Opal

What will the enchanting flash and glow of these Australian "black" opals lead you to create? ("Black," in the context of an opal, means that it has a dark background, from which bright flashes of color appear.)

This is a non-firable stone.

Stones are individually made and sourced. Some stones may not be calibrated using the same measuring device. There is also significant color variation, because these are natural stones, and opals have multicolored "flash." We will do our best to meet the stone sizes described. If ordering in pairs, we will match the stones as closely as possible.