Tiffany ‘Bird on a Rock’ brooch, estimated at $15,000-20,000 at Hindman.

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One of the Schlumberger’s best-known designs, first created in 1956, it was made in several forms with various large ‘rocks’ featuring different gems.

This example, which has an emerald cut beryl with the bird on top set with brilliant cut diamonds weighing approximately 2.5ct in total, has an estimate of $15,000-20,000.