Old, single-cut and round diamonds, engraved rock crystal, onyx, black enamel, platinum (French mark), 1920s, maker's mark (Gustave Renault)

Diamonds: main one for an approximate weight of 1.00 - 1.50 carats; the remaining for an approximate total weight of 10.00 - 10.50 carats. Total approximate weight of 11.00 - 12.00 carats

Size/Dimensions: 5.4 cm high
Gross weight: 29.1 grams

Active in Paris during the early 20th century, Gustave Renault was among the preferred suppliers of Cartier during the 1920s, creating high-jewellery pieces and precious objects for the maison. His workshop was celebrated for its precision and refined execution, reflecting the highest standards of Parisian craftsmanship. Renault’s work embodies the sophisticated geometry and restrained glamour of early Art Deco, as depicted in this brooch (lot 288) showcasing the use of black onyx combined with the brilliance of diamonds and the mat transparency of rock crystal. Following his death in 1927, the atelier was continued by his widow, before being acquired by Cartier in 1930.

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