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

• 4.36 carats.
• 20.8 x 6.6 mm / 0.81" x 0.25".
• 3.2 mm / 0.12" thick.
• Natural solid boulder opal.
• Mined by Sue at her Mt. Margaret opal mine in Queensland, Australia.
• Commercial grade.