Important emerald and diamond ring

Featuring a step-cut emerald weighing 30.32 carats, the shoulders each set with a step-cut diamond, size 51^1/2, sizing band.

Accompanied by SSEF report no. 72267, stating that the emerald weighing 30.32 carats, measuring 19.86 x 19.41 x 10.63 mm, is of Colombian origin, with a minor amount of oil in fissures, together with an appendix letter expressing the exceptional quality of this emerald. Swiss maker's mark. Stamped 750 for 18 carat gold. Emerald with very good transparency, medium strong saturation, with typical crystal inclusions, some surface reaching, for further information please refer to the report. Side diamonds estimated to weigh a total of approximately 3.75 carats, G-I colour, VS-SI colour, as gauged and graded in the mounting. Signs of very little use to the mounting. In very good condition. Total gross weight approximately 16 grams.
"In response to your inquiry, we are pleased to provide you with a general report of the condition of the property described above. Please note that colour, clarity and weight of gemstones are statements of opinion only and not statements of fact by Sotheby's. We do not guarantee, and are not responsible for any certificate from a gemological laboratory that may accompany the property. We do not guarantee that watches are in working order. Prospective buyers should inspect each lot to satisfy themselves as to condition and must understand that any statement made by Sotheby's is merely a subjective, qualified opinion. Prospective buyers should also refer to refer to any Important Notices regarding this sale, which are printed in the Sale Catalogue, in particular to the Notice regarding the treatment and condition of gemstones and to the Notice regarding import of Burmese jadeite and rubies into the US.
NOTWITHSTANDING THIS REPORT OR ANY DISCUSSIONS CONCERNING A LOT, ALL LOTS ARE OFFERED AND SOLD "AS IS" IN ACCORDANCE WITH THE CONDITIONS OF BUSINESS PRINTED IN THE SALE CATALOGUE."

"Microscopic examination revealed inclusions, which represent the hallmarks of Colombian emeralds from the famous mining areas such as Muzo, Coscuez, and Chivor, all located in the green foothills of the Cordillera Oriental in the Colombian Andes. Its vivid green colour is due to a combination of well-balanced trace elements in the gemstones, typical and characteristic for the finest emeralds from Colombia," SSEF appendix letter, 16 January 2014.