A brooch designed by Josef Hoffmann, estimated at €15,000-30,000 at Dorotheum.

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Conceived in his trademark geometric style, one is a unique round brooch decorated with garlands of cabochon gemstones which is dated to 1908 (estimate €60,000-80,000).

The other, shown above, is rectangular, made of malachite and silver, dates from 1911 and belonged to the family of the Viennese sculptor Anton Sinn who was a friend of both Hoffmann and the artist Gustav Klimt.

It has an estimate of €15,000-30,000.