An Art Deco sapphire and diamond brooch, by Mauboussin Paris, circa 1924. Set throughout with old European- and single-cut diamonds, and calibré-cut sapphires. The openwork platinum mount shows the typical ‘millegrains’ finish. Unsigned. Accompanied by the Mauboussin certificate of authenticity. Numbered, French maker’s mark and French assay marks for platinum and 18 karat gold.