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a close up of a ring with two different colored stonesa close up of a ring with two different colored stonesa close up of a brooch with two stones on ita close up of a brooch with two pear shaped diamondsa close up of a silver broochle with two white stonesa close up of a silver and white broochle on a white surfacea close up of a pair of scissors that are cutting a piece of metal
BOISGIRARD - ANTONINI

Estimate €8,000 - €10,000
Sale commission
Description
DIAMOND BROOCH Two triangular-cut diamonds — French craftsmanship, Auguste Leroy An elongated hexagonal brooch with Art Deco-style geometric decoration, in 18-carat gold (750 ‰) and platinum. It is set at both ends with two large old-cut triangular diamonds, their points facing each other on either side of a central X-shaped motif: one a ‘fancy’ brown diamond weighing 13.67 carats, the other a G-colour diamond weighing 4.57 carats. The openwork setting is entirely pavé-set with old-cut and eight-eight-cut diamonds, in an interplay of lines and triangles accentuated by millegrain detailing. The brooch is fitted with two retractable loops, allowing it to be worn as a pendant. The two diamonds may be reused stones, for which the setting was specially commissioned. The brooch mechanism was added at a later date. French craftsmanship, circa 1925–1930. Eagle’s head hallmark; master goldsmith’s mark of Auguste Leroy (active in Paris from 1912 to 1935). Height: 2.75 cm — Width: 4.57 cm — Gross weight: 18.44 g. The diamonds: — one old triangular-cut diamond, 13.67 ct, ‘fancy’ brown colour, clarity SI2, no fluorescence, Type IIa diamond, no indication of treatment; — an old-cut triangular diamond, 4.57 ct, colour G, clarity SI1, no fluorescence, Type IIa diamond, showing marked chips, no indication of treatment. Condition: scratches. Accompanied by two reports from the French Gemmological Laboratory, nos. 426403 and 426404, dated 15 June 2026.
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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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