This is a bright blue solid boulder opal from the Quilpie area in Queensland and has been set with diamonds in an 18k yellow gold ring.  Very unique.

Product Specification:

Product Code: R1108
Metal Type: 18k yellow gold
Opal Darkness: N2
Origin: Quilpie
Setting: Bezel
Size: O
Stone Dimmension: 11 x 8 mm