Lot 473. Gem-set and diamond bracelet-wristwatch, Ostertag, circa 1930. Estimate 95,000 — 140,000 CHF. Lot sold 206,500 CHF. Photo: Sotheby's 2012 The straps set with meandering vines of carved emeralds, sapphires and rubies, accented with marquise-shaped,...

An art deco diamond brooch, by Ostertag. Photo Christie's Image Ltd 2014 Of stylized shield outline, with two pavé-set diamond scrolls enhanced by baguette-cut diamond lines and circular-cut diamond collets to the side, 1930s, 5.5 cm, with French assay...

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...