A set of four small to large boulder opals with interesting patterning. The two smalls have some broad flashes of colour.

• 40.65 carats (total).
• Left, 11.8 x 8.2 mm / 0.46" x 0.32".
• 2.7 mm / 0.10" thick.
• Middle left, 15.4 x 11.3 mm / 0.60" x 0.44".
• 3.6 mm / 0.14" thick.
• Right middle, 30.5 x 12.2 mm / 1.20" x 0.48".
• 4.3 mm / 0.16" thick.
• Right, 27.8 x 15.9 mm / 1.09" x 0.62".
• 4.5 mm / 0.17" thick.
• Natural solid boulder opals.
  
• Mined by Sue at her Yaraka opal mine in Queensland, Australia.
• Lower commercial grade.