Nero Gems
5.92ct Oval Cabochon Opal
5.92ct Oval Cabochon Opal
Clear, semi-transparent opal cabochon, which when moved under the light shows a diffuse opalescence with flashes of green, blue, yellow and orange.
Semi-transparent opal cabochon. The opalescence is well distributed over the surface of the gem. Most likely it is the opaque 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 cracking of the surface
Source: Ethiopia|Natural
Cut: Cabochon|Oval
Weight in Ct: 5.92
Length in mm: 15.5
Width in mm: 11.0
Height in mm:
Treatments: Impregnated
Purity: Type II
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