Tiara, Cartier London, 1937. Diamonds, aquamarines, platinum. H. 5.04 cm. Collection Cartier, HO 12 A37 © Photograph by Marc Domage

This Art Deco tiara was created by Cartier in 1937; it combines round antique-cut diamonds with oval and other fancy-cut aquamarines, all set in platinum. Its design is distinctly geometric: a continuous band of stones forms the base, above which rise a sequence of slightly angled vertical motifs.

The tiara is on view as part of the exhibition ’Dynastic Jewels’ which is on display until 6 April 2026 at The Al Thani Collection at the Hôtel de la Marine, Paris.