Green and blue boulder opal, 4.37ct

Estimated Value $75-$100

  • 4.37ct, 10.6x8.36x4.68mm from Queensland, Australia;
  • Brightness: 2 of 5.

Thin layer of precious opal on ironstone has the most beautiful greens and some blues. Boulder opal can be very frustrating, as the layer of opal can be very thin and is tricky to polish.

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