A lovely small free-form blue and green boulder opal.  

• 3.15 carats.
• 18.9 x 6.8 mm / 0.74" x 0.26".
• 3.1 mm / 0.12" thick.
• Natural solid boulder opal.
• Mined by Sue at her Mt. Margaret opal mine in Queensland, Australia.
• Commercial grade.