Marquise Shape Diamond Ring. Set to centre with a marquise shape old cut diamond, J colour, VS2 clarity, with a weight of 4.29 carats in an open back claw setting, encircled by twenty single cut diamonds in rubover settings with a combined weight of 0.4 carats, flanked by six round single cut diamonds in a rubover settings, with a total combined weight of 0.12 carats. The total approximate diamond weight is 4.81, to an elegant flanked solitaire design featuring stylised split claws, an intricately pierced gallery and fancy open backholing, leading to a decorative shoulders with milgrain edging and flowing through to a solid tapering D shaped shank. Marked platinum, makers mark 'R Fres' for Rubel Frères, French, circa 1920, accompanied by Gemological Institute of America (GIA) report #2239365127.

Founded in 1915, the workshop of brothers Jean and Robert Rubel crafted pieces for many prestigious jewellery houses, including Ostertag and Lacloche. Most notably, they served as one of the principal workshops for Van Cleef & Arpels (VCA) during the 1920s.

In 1939, at the request of Van Cleef & Arpels, Jean and Robert Rubel moved to New York to manage VCA’s American workshop, entrusting their French workshop to their nephew, Marcel. In 1943, the brothers decided to part ways with VCA and established their own firm, John Rubel & Co., at 777 Fifth Avenue in New York, where they began designing and selling jewellery under their own name.

After nearly a decade of operating independently in America, the brothers closed their business and returned to France to reunite with their family.

For over three decades, Rubel Frères delighted clients with the quality and creativity of their jewellery. Today, their pieces continue to command admiration and respect from those fortunate enough to wear them.

The ring is in excellent condition.