Mauboussin, an Art Deco sapphire and diamond double clip brooch, France, circa 1935, designed as a geometrically stylised bow, set with step-cut sapphires, circular-, single-cut, cushion-shaped and baguette diamonds, with sections of polished platinum, combined length 5.4cm, detaching into two separate brooches, each 2.7 x 3.1cm, each clip signed Mauboussin Paris, French assay marks for 18ct gold and platinum, indistinct French maker's marks, each indistinctly numbered Cf.: Marguerite de Cerval, Mauboussin, Editions du Regard, Paris, 1992, p.130 for a double clip brooch of similar 'Papillon' design in platinum and diamonds, with similar accents of polished platinum, circa 1935

Composed of several subsidiaries, the Drouot Group is a major player in the art market. Hôtel Drouot, located in the heart of Paris, has been the world's largest public auction center since 1852. 15 salerooms are available to more than 70 auction houses. The emulation generated by an annual offer of 230,000 artworks from 21 major specialities - from Antiquity to street art - attracts some 3,000 visitors every day. The Group's digital platform, Drouot.com, offers digital sales - Live auctions (live broadcasting and participation in auctions), Online-only auctions (dematerialised auctions) and Buy Now sales (sales of lots at fixed prices). Nearly 2 million items are offered annually by 600 auction houses. Auction news is reported every week in La Gazette Drouot, the leading weekly magazine for the art market and culture published by Auctionspress.