Koroit boulder opal from the Queensland opal fields. Light and dark ironstone with colour islands and veins of turquoise, green, blue and pink. A very nice freeform shape width 23mm, length 28mm, thickness 4.8mm. Weight 34.7carats, 6.94grams.

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Weight 6.94 g
Dimensions 28 × 23 × 4.8 mm

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