Black Chalama Opal Ring / Cabochon / new- 2.38 g - (1)

Ring Black Chalama Opal / Cabochon / new

Set in 925 sterling silver

9.8 mm x 7.7 mm

Weight: 2.38 g / 11.9 ct

New and unworn

Ring size:

EU 54
UK N
US 6.8
FR 14
Inner diameter: 17.2 mm

Black opals, like their differently colored counterparts, occur as spherical to knobbly masses with no recognizable crystal structure. Their beauty typically reveals itself only after this material is cut/polished. Characteristic for this form of opal is its opalescence, which shines most vividly in intense rainbow play.
Moreover, the host rock of the opal here is dark, grayish to black, which gave it this name.

Black opals form, just like other opals, from silica-rich fluids that crystallize in sediments or volcanic rocks. Their characteristic shimmer is due to water inclusions inside this mineral.

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