Three ruby and diamond rings

One ring set with an oval ruby stated to weigh 1.59 carats, the mount accented with brilliant-cut and baguette diamonds, size 52, maker's mark for Gübelin, one ring set with a cushion-shaped ruby stated to weigh 1.89 carats, between shield-shaped diamond shoulders, size 52^1/2, and one ring of bombé design set with a heart-shaped ruby stated to weigh 1.90 carats, the mount pavé-set with brilliant-cut diamonds, size 48.

Accompanied by Gübelin report no. 17037066, stating that the oval ruby stated to weigh 1.59 carats, measuring approximately 6.70 x 5.95 x 4.05mm, is of Burmese origin, with no indications of heating. Together GRS report no. GRS2015-028006, stating that the cushion-shaped ruby stated to weigh 1.89 carats, measuring 8.57 x 5.79 x 2.79mm, is of Thai origin, with no indications of thermal treatment. Also accompanied by AGL report no. CS 8085606, stating that the heart-shaped ruby stated to weigh 1.90 carats, measuring approximately 7.3 x 8.1 x 3.69mm, is of Thai origin, with evidence of heat enhancement. One ring with a maker's mark for Gübelin, stamped 750 for 18 carat gold. Inscribed SWISS and R 1.59 ct, referring to the carat weight of the ruby. Ruby purplish red of mediums strong saturation, with typical inclusions visible under 10x magnification. For more information on the ruby, please refer to the Gübelin report. Diamonds bright and lively. Signs of wear to the metal consistent with use. In very good condition. Gross weight approximately 8 grams. One ring stamped Pt 950 for platinum, 750 for 18 carat gold and OR for gold. Inscribed THAI-NH-V.RED GRS and 1.89, referring to the carat weight of the ruby. Ruby red of medium strong saturation, with typical inclusions. For more information on the ruby, please refer to the GRS report. Diamonds bright and lively. Scratches to the metal consistent with light use. In very good condition. Gross weight approximately 5 grams. One ring stamped 750 for 18 carat gold. Inscribed RU THAI H - EGL, RU-THAI, AGL and 1.90, referring to the carat weight of the ruby. Ruby red of strong saturation, with typical inclusions visible under 10x magnification, minor abrasions. For more information on the ruby, please refer to the AGL report. Diamonds bright and lively. Evidence of wear to the metal. In very good condition. Gross weight approximately 5 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.
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."