A large, free-form (almost rectangular) boulder opal with rainbow colours on a lighter background / body tone.

• 20.97 carats.
• 23.6 x  15.1 mm / 0.92" x 0.59".
• 5.4 mm / 0.21" thick.
• Natural solid boulder opal.
• Mined by Sue at her Yaraka opal mine in Queensland, Australia.
• Commercial grade.