Black Chalama Opal Ring / cabochon / new- 2.48 g - (1)

Ring Black Chalama Opal / cabochon / new

Set in 925 sterling silver

10.1 mm x 7.8 mm

Weight: 2.48 g

New and unworn

Ring size:

U 57
UK P 1/2
US 8.0
Fr 17
Inner diameter: 18.1 mm

Black opals appear, like their differently colored counterparts, as rounded to knobby masses with no detectable crystal structure. Their beauty usually reveals itself only after the stone is cut and polished. Characteristic of this form of opals is their opalescence, which manifests in an intense rainbow sheen. Additionally, the host rock of the opal here is dark, gray to black, which gave it this name.

Black opals form, like other opals, from siliceous fluids that crystallize in sediments or volcanic rocks. Their characteristic shine is due to water inclusions inside the mineral.

Shipping as insured registered mail.