Vintage 16mm Black Opal Mosaic Soft Square Cabochons Opal Inlay 13.5 CTS . We used to cut precious BlackOpal from Australia in1970’s. Saved all the off cuts and scraps and had them made into mosaics with black onyx. All the stones are natural and made in 1980. We have about 20 pair which we just unpacked. Brilliant Opal. Hand cut, some slight difference in stone sizes, but good pairs.

Mosaic inlay of Australian Opal and black onyx. Soft square opal inlays measure about 16mm.