Cabochon cat's eye chrysoberyl, single-cut diamonds, 18k yellow gold and platinum (French marks),

SSEF, 2024, report no. 141846: Cat's eye Chrysoberyl, with a distinct cat's eye effect, Ceylon (Sri Lanka), no indications of heating, with Appendix

Cat's eye Chysoberyl: approximately 40.00 - 45.00 carats

Size/Dimensions: EU ring size 56 / US ring size 7¹⁄₂
Gross weight: 34.2 grams

Chatoyancy, often referred to as the "cat's eye effect," is an optical phenomenon observed in certain gemstones where a bright band of light appears to move across the surface when the stone is cut into a cabochon shape (rounded, not faceted). This effect resembles the slit of a cat's eye and is caused by the reflection of light off parallel needle-like inclusions or fibrous structures within the gemstone.
The greater the transparency of the stone, and the fewer visible inclusions, the more valuable the gemstone becomes. Lot 280 exhibits exceptional transparency, making it a unique and rare specimen of significant worth.

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This lot is offered by Christie's International SA

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