This is an all art drawing of an imaginary Boulder Opal Cabachon showing part of the iron rich host rock. Our 1” thick polished blocks stand upright on flat surfaces and are made from a superior cast method for clarity, depth and realism. The image in the print is created by artisan Giclee process and has been enlarged for a superb viewing experience. Makes a stunning showpiece on shelf, desk, table! Photo credit: Klaus Schäfer. Original art credit: Old Earth Art