|Dimensions (mm)||35 x 18 x 9mm|
|Weight (carats)||48 carats|
CATS EYE OPAL
This is a green natural untreated stone from Brazil showing chatoyance [cats eye] effect.We have selected this piece as it has a strong cats eye effect.
Hardness mohs scale 5.5 to 6.5
Chatoyancy or chatoyance, is an optical reflectance effect seen in certain gemstones Coined from the French “oeil de chat”, meaning “cat’s eye”, chatoyancy arises either from the fibrous structure of a material, as in tiger eyequartz, or from fibrous inclusions or cavities within the stone, as in cat’s eye chrysoberyl. The effect can be likened to the sheen off a spool of silk: the luminous streak of reflected light is always perpendicular to the direction of the fibres. For a gemstone to show this effect best it must be cut en cabochon, with the fibers or fibrous structures parallel to the base of the finished stone.
|Starts||21st Feb 2018 7:55pm PST|
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