Queensland Boulder Opal - Red, Blue, Green Gold Tone Earring with the doublet backer is

with the doublet backer is piece of grey opal "potch" or single colour opal

This one has 10 with pink sapphires that fade from light to dark to light again

which enhances the appearance of their colour

aquamarines and mint greens

Butterfly back size 8mm

Queensland Boulder Opal - Red, Blue, Green Gold Tone Earring with the doublet backer isFrom Tall Trees Studio Solid piece of red, blue, green and gold tones Queensland Boulder Opal on Ironstone. Boulder opal forms within ironstone boulders, the silica, a key component of opal, is released into the groundwater through the weathering of surrounding rocks, particularly sandstones and mudstones. Groundwater moves through the rock, it carries the dissolved silica and its this silica rich water then seeps into cracks and voids within the