Exceptional diamond ring, JAR

Claw-set with a round-cornered rectangular modified brilliant-cut diamond weighing 11.70 carats, to a mount set with single-cut stones, mounted in platinum,

Stamped PT 950 and French assay marks for platinum, signed JAR PARIS. Please refer to GIA report for detail on diamond together with Gubelin note and appendix to report. Estimated total diamond weight in mount approximately 0.75 carats, bright, lively stones. Minor scratches to mount due to normal 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 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."

'Golconda' is a name steeped in the annals of diamond lore. The name of a now ruined fortress which originally served as a commercial trading centre, some days distant from the historic Indian mines of Ramalakota, Kollur and Soumelpour. The term 'Golconda' has now survived to describe the historic diamonds peculiar to India of great limpidity and purity. These diamonds are from the famed 'First water' mines, which produced the world's most spectacular diamonds, such as The Koh-I-Noor, The Hope and The Agra. This beautiful stone, with its appealing antique cut, is a member of the rare Type IIa group of diamonds known for their extreme purity, qualities compared so often throughout history to pure crystallized water. Scientifically this purity is due to the absence of nitrogen, producing stones often said to be beyond white.

In our opinion, this present gemstone is probably part of the highly desirable group of surviving diamonds which were mined in the Golconda region up to the beginning of the XVIIIth century.

Widely acknowledged as being the most talented jeweller of his generation, JAR was established on the Place Vendôme in Paris in 1977 by Joël Arthur Rosenthal, better known by his trade name JAR. Born in New York City, Rosenthal studied art history at Harvard University, later working in the film industry and then with Bulgari. Drawing upon the past, but allowing his natural creativity to dominate, he has reinterpreted jewellery as an art form, crossing the boundaries between ornamental jewels and sculpture. JAR's work is always imaginative and beautifully crafted and often incorporates unusual gemstones in brilliant and unexpected combinations.  A 10th anniversary celebration exhibition was held in New York in 1987 and a larger highly glamorous retrospective of 400 jewels was on show at The Gilbert Collection, Somerset House in London in 2002.