Gem set and diamond necklace and two rings

The necklace set with pear-shaped sapphires, mother-of-pearl and brilliant-cut diamonds, inner circumference approximately 375mm, Italian maker's mark, gross weight approximately 136 grams; one ring collet-set with a facetted yellow sapphire, size M; and one ring set with an oval sapphire between demi-lune and tapered baguette diamond shoulders, size M.

Accompanied by CISGEM report no. 2034, stating that the piece contains mother-of-pearl. Necklace: Stamped 18K and 750 for 18 carat gold. Italian maker's mark 1813AL. Stamped Italy. Mother-of-pearl in good condition, displaying typical characteristics. Sapphires of dark blue, transparent, typical inclusions visible under magnification, light abrasions consistent with wear. Estimated total diamond weight approximately 3.00-4.00 carats, diamonds bright and lively. Secure clasp. Scratches to metal consistent with wear. Sapphire ring: Stamped 750 for 18 carat gold. Italian maker's mark 2573AL. Sapphire measuring approximately 10.1 x 8.2 x 4.5mm, calculated to weigh approximately 2.98 carats, dark blue, transparent, typical inclusions visible under magnification, light abrasions and minor chips consistent with wear. Diamonds weighing approximately 0.50-1.00 carat, diamonds bright and lively. Scratches to metal consistent with wear. In good condition. Yellow sapphire ring: Stamped 750 for 18 carat gold. Italian maker's mark 1973AL. Sapphire medium yellow, transparent, typical inclusions visible under magnification, light abrasions consistent with wear. Scratches to metal consistent with wear. In 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.
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."