A pair of antique emerald and diamond earrings, late 19th Century. photo: Christie's Images Ltd 2012 Each set with a square-shaped emerald in an old-cut diamond surround, mounted in silver and gold. Lot 69. Estimate CHF74,000 - CHF110,000 Accompanied...

An Antique Emerald and Diamond Brooch, late 19th Century. photo: Christie's Images Ltd 2012 Of square shape, centering upon a square-cut emerald, to the old-cut diamond openwork surround, mounted in silver and gold, 3.3 cm. Estimate CHF28,000 - CHF46,000...

An Antique Emerald and Diamond Necklace. Photo: Christie's Images Ltd 2012 The two rows of rectangular-cut emerald and old-cut diamond graduated clusters interspersed by diamond collets, to the similar single-row backchain, mounted in silver and gold,...

René Boivin. An Impressive Diamond Ring . Photo Philips de Pury & Company Set with an old-cut diamond, weighing approximately 11.20 carats, to the feather motif shoulders set with circular-cut colored diamonds, mounted in 18K yellow gold, size 3 3/4....