53682.0 - Australian Queensland Boulder Opal 77.10 cts 49mm Long x 33mm Wide x 5.4mm Deep Double Sided Perfect Bola Slide Size Unique Gem

Very large, 77.10 carats, Australian Boulder Opal.
It is 49 x 33 x 5.4 mm (High, Wide, Thick). Polished on both sides with one side being quite flat, but can still be worn with either side being the front.