Opals

Opals are one of the most unique gemstones in the world, known for their unique iridescent, fire-like appearance.Opals are in a class by themselves.

• Color: All colors, with black being the rarest. Precious opals will appear iridescent over whichever primary body tone they have.

• Crystal structure: Amorphous solid (not crystalline)

• Luster: Subvitreous to waxy

• Transparency: Transparent to opaque; Typically translucent to opaque

• Refractive index: 1.450 +0.020/-0.080

• Specific Gravity: 2.09

• Cleavage: None

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