A pair of diamond clip brooches, by Ostertag. Photo Christie's Image Ltd 2014

Each clip designed as a stylized scroll set with brilliant and baguette-cut diamonds, can be attached together with an additional brooch fitting to form one brooch, 1930s, each 5.6 cm, with French assay mark for platinum and gold. Signed Ostertag (2). Estimate CHF10,000 – CHF15,000 ($11,474 - $17,211)

FROM THE ESTATE OF BARONESS GUNHILD THYSSEN-BORNEMISZA DE KASZON