Two gem-set blackamoor brooches, Nardi. Photo Bonhams

one designed with a tunic accentuated by circular-cut emeralds and rubies and off-round cultured pearls, the turban detailed with circular-cut emeralds and reverse-set oval-shaped garnet; the other with a tunic accentuated by circular-cut sapphires and emeralds and off-round cultured pearls, the turban detailed with circular-cut sapphires and reverse-set oval-shaped garnet; each mounted in silver and eighteen karat gold; gross weight approximately: 47.2 grams; lengths: 2 1/4 and 2 1/8in. Lot 177. Estimate: US$ 5,000 - 7,000 £3,100 - 4,400 €3,800 - 5,300

Bonhams. 19 Apr 2012 1 p.m. New York. Fine Jewelry www.bonhams.com