Nero Gems
5.23ct Cabochon Drop Cut Opal
5.23ct Cabochon Drop Cut Opal
Semi-transparent cabochon that when moved under the light shows a diffuse opalescence in orange and green, which moves on a cream-colored background. The gem has a darker yellow veining. Good cut proportions
Semi-opaque opal cabochon. The opalescence is well distributed over the surface of the gem. Most likely it is the hydrophane variety: a type of unstable opal that is regularly treated by impregnation with artificial silica gel. This treatment serves to stabilize the opal and make it less porous.
Source: Ethiopia|Natural
Cut: Cabochon|Drop
Weight in Ct: 5.23
Length in mm: 17.0
Width in mm: 10.2
Height in mm:
Treatments: Impregnated
Purity: Type II
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