An Art Deco emerald diamond and black onyx ring

An Art Deco emerald diamond and black onyx ring, the emerald-cut emerald is millegrain-set within a border of circular-cut diamonds and triangular onyx cabochons in pierced platinum mount, size O ½

Accompanied by report number 78130-10 dated 22 November 2017 from GCS, London stating that the octagonal-cut emerald weighs approximately 1.80cts and is a natural emerald with indications of moderate clarity enhancement, origin: Columbia