This very attractive Pink/Gold/Violet solid boulder opal from the Quilpie area in Queensland is claw set in 14k yellow gold. There is a diamond at the top of the stone and there is a simple design on the bail.  

Product Specification:

Product Code: P1177
Metal Type: 14k yellow gold
Opal Darkness: N7
Origin: Quilpie
Setting: claw
Stone Dimmension: 18mm x 8mm
Stone Type: Queensland Boulder Opal / Diamond