Emerald and diamond necklace

Set with a step-cut emerald between four circular-cut diamonds, accented with similarly-cut and marquise shaped diamonds and trapeze-shaped emeralds, length approximately 415mm. 

Accompanied by CISGEM report no. 84347, stating that the emerald is natural, with moderate clarity enhancement. Emerald measuring approximately 12 x 9 x 7 mm, calculated to weigh approximately 5.25 carats, emeralds medium green, well matched in colour, typical inclusions visible to the naked eye, some slight surface reaching fissures. Estimated total diamond weight approximately 15.00-17.00 carats, estimated colour of two larger stones K-L, estimated clarity Vs, estimated colour of two smaller stones I-J, estimated clarity SI-I; Secure clasp fitting. Clasp secure. In very good condition.
"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."

Accompanied by CISGEM report no. 84347, stating that the step-cut emerald is natural, with moderate clarity enhancement.