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a diamond and sapphire cluster ringa close up of a diamond and sapphire ring on a white backgrounda close up of a diamond and sapphire ring on a white surfacea close up of a diamond and sapphire ring on a white backgrounda close up of a silver spoon and fork on a table
BOISGIRARD - ANTONINI

Estimate €3,000 - €4,000
Sale commission
Description
BAND RING Diamonds and sapphires A domed band ring in 18-carat white gold (750 ‰) and platinum, centred on a large diamond flanked by two old-cut diamonds, set within a lavish setting of old-cut diamonds, navette-cut diamonds and navette-cut sapphires arranged in alternation. Openwork setting. The centre diamond: a rectangular step-cut diamond; dimensions 7.61 × 7.23 × 4.44 mm; weight 2.03 ct; colour J; clarity VS2; very strong fluorescence; no indication of treatment. Comment: additional facets (report from the French Gemmological Laboratory No. 426401 dated 15 June 2026). French craftsmanship, mixed setting of 18-carat white gold (750 ‰) and platinum; hallmarks: eagle’s head (gold) and dog’s head (platinum). Master’s hallmark of the goldsmith and jeweller René Dieu (initials RD, symbol of two ears of wheat), 35 Rue Oberkampf, Paris, engraved on 28 January 1933. Circa 1945–1950. Ring size: 56 — Gross weight: 12.9 g.
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About the sale Charity sale in aid of the Petits Frères Des Pauvres charity
Auction location
Auction time 10/25/2026 at 10:00 AM
Pictures credits:
Boisgirard Antonini
See original version (French)
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