Opal Jewelry Australian made, these stunning flashing bright aqua blue/green, azure and rich royal blue to violet colors abound in these genuine Australian boulder opal doublets.  Hand made here in our Australian factory, the earrings are solid 18k yellow gold with a safety clasp on the shepherd hooks for added security. Each earring hangs 30 millimeters and the setting is 11.5 millimeter wide. Opal October Birthstone and wouldn't these opal jewels make the perfect birthday present.