Cartier, brooch transformed into an Art Deco platinum necklace centerpiece, entirely pavé-set with rose-cut and old-cut diamonds, calibrated onyx elements, and ruby beads and cabochons, mounted on a later double cord adorned with 750 white gold elements set with old-cut diamonds and a ruby cabochon, central element signed Cartier London, height 6.3 cm, length 34 cm

Cartier, brooch transformed into an Art Deco platinum necklace centerpiece, entirely pavé-set with rose-cut and old-cut diamonds, calibrated onyx elements, and ruby beads and cabochons, mounted on a later double cord adorned with 750 white gold elements set with old-cut diamonds and a ruby cabochon, central element signed Cartier London, height 6.3 cm, length 34 cm

Mount: overall condition is good considering the age of the piece. The brooch system was removed to fix attacments hooks.
Signature Cartier London, no visible hallmark
Hallmarks Séchaud on the later double cord clasp

Gems: overall condition is good. Presence of small natural fractures and cracks on some rubies
Major diamonds :
approx. 5.3x5.6x4.97 mm approx. 0.95 ct
7.79x7.73x4.04 mm approx. 1.5 ct
Si1 / H-I
Fluo: faint/none