Quetaro, Mexico Obtained in the 1960s, few jelly opals exist on the market today of comparable size and quality. Fashioned as a large oval cabochon, this fine opal has multi-color play-of-color in a transparent white body color. Designed by its original owner, a 14K yellow gold mount in the form of a turtle brooch accompanies the lot. Weighing approximately 56.73 carats and measuring 29.2 x 25.4 x 15.2 mm. Length of brooch: 1 3/4 in