Onyx, natural pearl and diamond necklace, 1930s

Designed as a series of onyx beads, embellished with circular-cut diamonds, between groups of small natural pearls, the drum clasp set with buff top onyx and circular-cut and baguette diamonds, length approximately 415mm, indistinct maker's and assay marks. 

Stamped to clasp with indistinct assay marks, numbered 4831 and 113P NY, partial maker's mark R I within a lozenge. Accompanied by The Gem & Pearl Laboratory report no. 09399 stating that the pearls were found to be natural, saltwater. Overall in good condition, with some minor abrassions commensurate with age and wear, secure clasp.
"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 The Gem & Pearl Laboratory report no. 09399 stating that the pearls were found to be natural, saltwater.