An Art Deco sapphire and diamond brooch

An Art Deco sapphire and diamond brooch, circa 1920, centring on a cushion-shaped sapphire within a millegrained border of circular-cut diamonds, to a bar brooch designed as a ribbon channel-set with calibré-cut sapphires and pavé-set with circular-cut diamonds, mounted in platinum, length 6.3cm, French import assay mark, brooch pin with indistinct signature