The centre set with a step-cut emerald weighing approximately 6.43 carats, to a mount of pierced quatrefoil design, set with circular-cut diamonds, signed Koch.

Accompanied by Gubelin report no. 17110087, dated 22nd November 2017, stating that the emerald measuring 12.8 x 12.6 x 6.4mm is of Colombian origin, with indications of insignificant clarity enhancement. Pin fitting to brooch signed Koch. Estimated total diamond weight approximately 4.00 - 5.00 carats. Overall dimensions approximately 45 x 45mm, gross weight approximately 23.5 grams. Overall in good condition. Case stamped Boucheron.
"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.
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."

Accompanied by Gübelin report no. 17110087, stating that the emerald is of Colombian origin, with indications of insignificant clarity enhancement.