Important sapphire and diamond ring, Van Cleef & Arpels

Set with a step-cut sapphire weighing 45.74 carats, between tapered baguette diamond shoulders, size 49, sizing band, signed Van Cleef & Arpels, numbered, assay mark. 

Accompanied by SSEF report no. 90968, stating that the step-cut sapphire weighing 45.74 carats, measuring 20.57 x 17.00 x 13.25mm, is of Burmese origin, with no indications of heating, 'royal blue' colour, together with an appendix letter. Signed VAN CLEEF & ARPELS, maker's mark for Van Cleef & Arpels, numbered 16146 S.A. Stamped Pt 950 for platinum. Sapphire blue of strong saturation, with minor typical inclusions, some surface reaching; for further details on the stone, please refer to the gemmological report. Side diamonds bright and lively. Signs of normal wear to the metal consistent with use. In very good condition. Gross weight approximately 17 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."

"The described sapphire exhibits an impressive size and weight of 45.740 ct, combined with an exceptional purity and attractive well saturated blue colour. 

The few inclusions found by microscopic examination are consistent with those found in sapphires from the classic mines along the Mogok Gemstone Tract in Burma (Myanmar). Its attractive and saturated blue colour, poetically also referred to as 'royal blue', is due to a combination of well-balanced trace elements in the gemstone, which are typical and characteristic for fine sapphires from Mogok, Burma".

Excerpt from the SSEF appendix letter