A set of four boulder small to large opals with interesting patterning.

• 42.11 carats (total).
• Left, 12.9 x 11.7 mm / 0.5" x 0.46".
• 4.9 mm / 0.19" thick.
• Middle left, 24.3 x 11.9 mm / 0.95" x 0.46".
• 5.1 mm / 0.20" thick.
• Right middle, 32.8 x 8 mm / 1.29" x 0.31".
• 3.9 mm / 0.15" thick.
• Right, 27.6 x 20.3 mm / 1.08" x 0.79".
• 5.8 mm / 0.22" thick.
• Natural solid boulder opals.
  
• Mined by Sue at her Yaraka opal mine in Queensland, Australia.
• Lower commercial grade.