A large geometric matrix boulder opal with some rainbow stripes on a dark body tone / background.

• 47.70 carats.
• 41.6 x 21.6 mm / 1.63" x 0.85".
• 6.5 mm / 0.25" thick.
• Natural solid boulder opal.
• Mined by Sue at her Yaraka opal mine in Queensland, Australia.
• High commercial / gem grade.
• Opal ID 2504.