An Art-deco Diamond, Onyx, Coral And Sapphire Brooch

Platinum, diamonds, onyx coral sapphire
Dim.6.1 x 2.1 cm (2 ³/₈ x 0 ⁷/₈ inches)
Total weight 13,20 gr
Circa 1925

A striking Art Deco brooch of elongated rectangular form, executed in platinum with a sophisticated geometric design characteristic of the period's finest craftsmanship. The central panel features an openwork pattern of parallel lines set with round 8/8-cut diamonds, creating a luminous rhythmic effect. At the centre, a bezel-set old European-cut diamond commands attention, dramatically framed within a hexagonal onyx surround that emphasizes its brilliance through bold chromatic contrast.
The terminals are conceived as stylised palmettes—an Egyptian Revival motif beloved of the Art Deco era—composed of calibré-cut onyx chevrons, triangular coral cabochons of warm reddish-orange hue, and calibré-cut sapphires of vivid cornflower blue. This tricolour palette of coral, sapphire and onyx, accented by the white fire of diamonds, exemplifies the daring polychromy that defined the most sophisticated Parisian jewellery of the 1920s.
The architectural precision of the composition, the quality of the stone-setting, and the harmonious balance of colour and form suggest the work of a major maison, possibly of French origin.