570 Ct green-blue boulder opal specimen

A boulder opal specimen with lovely ocean colours flowing throughout the host rock, with a little caramel too. 

• 570 carats / 114 grams
• 53.2 x 45.2 mm / 2.09" x 1.78".
• 25 mm / 0.98" thick.
• Natural solid boulder opal specimen.
• Mined by Sue at her Mt Margaret opal mine in Queensland, Australia.
• Sits on its flat base.