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A black spinel of 2
99 carats in a cushion cut — unheated
92 carats in a round cut — heat-treated
moderately strong intensity
84 cts total weight
2.92ct Freeform Cabochon Gray Opal from Australia 0 Colourless or White/3 Light A black spinel of 2A multi coloured opal of 2. 92 carats in a cabochon unheated, from Australia, with some inclusions you can see. Opal's play of colour comes from microscopic silica spheres splitting light into flashes of colour. Gem Details Gem Type: Opal Number of stones: 1 Weight: 2. 92 cts Measurements: 14. 44 9. 83 3. 66 mm Shape: Freeform Cutting Style: Cabochon Transparency: Translucent Clarity: N A Colour: Gray Hue: Gray Tone: 3 Light Species: Opal Treatment: