Nero Gems
2.19ct Cushion Cut Opal Cabochon
2.19ct Cushion Cut Opal Cabochon
Semi-transparent cabochon that when moved under the light shows a diffuse opalescence in yellow and green, with flashes of red.
Semi-transparent opal cabochon. The opalescence is well distributed over the surface of the gem. It is most likely the hydrophane variety: a type of unstable opal that is regularly treated by impregnation with artificial silica gel. The treatment serves to decrease the porosity of the hydrophane and stabilize it. It is recommended not to let it come into contact with liquids in general, because hydrophane absorbs them and stains. It is also sensitive to changes in humidity, which can cause the surface to crack.
Source: Ethiopia|Natural
Cut: Cabochon|Cushion
Weight in Ct: 2.19
Length in mm: 11.0
Width in mm: 7.0
Height in mm:
Treatments: Impregnated
Purity: Type II
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