Black Chalama Opal Ring / Cabochon / new- 2.24 g - (1)

Ring Black Chalama Opal / Cabochon / new In 925. Sterling silver set 10.1 mm x 6.7 mm Weight: 2.24 g / 11.2 ct New and unworn Ring size: U 62 UK T 1/2 US 9.9 FR 22 Inner diameter: 19.7 mm Black opals occur, just like their differently colored counterparts, as rounded to knobbly masses with no recognizable crystal structure. Their beauty usually reveals itself only after the polishing of this material. Characteristic of this form of opals is their opalescence, which appears in intense rainbow shimmers. Moreover, the host rock of the opal here is dark, gray to black, which gave it this name. Black opals form, like other opals, from silica-rich fluids that crystallize in sedimentary or volcanic rocks. Their characteristic shimmer is due to water inclusions inside this mineral. Shipping as insured registered mail.

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