46.95 carats Burmese sapphire and diamond necklace, 'Navire', Alexandre Reza, 1989. Estimate 295,000 — 490,000 CHF.Photo Sotheby's

Composed of a line of collet-set brilliant-cut diamonds, the front highlighted with two rows of similarly set diamonds, two fancy-shaped sapphires framed with brilliant-cut diamonds, a triangular diamond surrounded with circular-cut stones, suspending an oval sapphire stated to weigh 46.95 carats, within a frame of geometric design set with tapered baguette and brilliant-cut diamonds, length approximately 430mm, signed AR, French assay and maker's marks, one small sapphire damaged, case signed Alexandre Reza.

Accompanied by SSEF report no. 78794, stating that the largest sapphire is of Burmese origin, with no indications of heating. 

Bibliography: Cf.: Vivienne Becker, Alexandre Reza, New York, 2011, for an illustration of this necklace. 

Notes: The brand’s founder, Alexandre Reza, is thought to be among the greatest gemstone collectors and merchants of all time. It was Reza’s deep affinity for gems and extraordinary eye for beauty that drove him to amass a collection of stones unlike any other in existence. Coupled with spectacular design and exemplary craftsmanship, Reza’s rare and exceptional inventory is the cornerstone of the brand’s unparalleled offering.

Currently led by Alexandre’s son, Olivier Reza, the brand continues to pursue its founder’s passion for perfection and dedication to awing its clients. With a global heritage, yet settled in France, the Maison continues to appeal to the same level of international collectors that Alexandre first attracted. With its home at 21, Place Vendome in Paris, REZA serves the brand’s clientele: those who seek exceptionality, exploration, and a caliber of stone and design that cannot be found elsewhere. 

Sotheby's. Magnificent Jewels and Noble Jewels, Genève, 11 nov. 2015, 10:00 AM