Lot · Loose Gemstones
18.07 ct Fancy Cabochon Shape (26 x 15 mm) Australian Koroit Boulder Opal
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Sat · Jul 18, 2026
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ZIP 752**
targetgems
29,600 ratings · 99.30% positive
Description
From the seller18.07 ct Great looking Fancy Cabochon Shape (26 x 15 mm) Play of Colors Australian Koroit Boulder Opal Natural Loose Gemstone. Boulder Opal. Mohs Hardness: 5.5-6.5 Found in Australia History: Opal is a semi-transparent solidified mineral composed of silicon and water.
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