This is a bright green solid boulder opal.  It is set in 18k white gold and diamonds in a very stylish setting.  The colour in the opal is much better than in the picture.

Product Specification:

Product Code: R1157
Metal Type: 18k white gold
Opal Darkness: N7
Origin: Quilpie
Setting: Claw with 5 diamonds
Size: Q
Stone Dimmension: 7mm x 7mm
Stone Type: Queensland Boulder Opal