A set of three boulder opals with interesting patterning.

• 12.05 carats (total).
• Left,  12.8 x 8.5 mm / 0.50" x 0.33".
• 3.3 mm / 0.12" thick.
• Middle, 18.6 x 6.7 mm / 0.73" x 0.26".
•  3.4 mm / 0.13" thick.
• Right, 24.7 x 8.5 mm / 0.97" x 0.33".
•  3.0 mm / 0.11" thick.
• Natural solid boulder opals.
  
• Mined by Sue at her Yaraka opal mine in Queensland, Australia.
• Lower commercial grade.