A 'CHAMELEON' DIAMOND, COLOURED DIAMOND AND DIAMOND RING. Set with a modified rectangular-shaped fancy greyish green 'chameleon' diamond weighing 8.88 carats, within a brilliant-cut pink diamond surround, to the brilliant-cut diamond bifurcated shoulders, mounted in 18k white and rose gold.
AN ART DECO DIAMOND, COLOURED DIAMOND AND ONYX BROOCH, BY OSTERTAG Designed as two shield-shaped openwork diamond-set motifs, each centering upon a pear-shaped cabochon onyx and gathered by a yellow cushion-shaped collet-set diamond on a diamond bombé connecting link, circa 1925, 7.2 cm, with French assay marks for platinum and gold Signed Ostertag France
A FINE AND RARE FANCY RED DIAMOND, COLOURED DIAMOND AND DIAMOND BROOCH Set with a rectangular-cut fancy red diamond weighing 0.73 carat, in an old-cut diamond surround, suspended from a diamond-set foliate garland, enhanced with pink diamond collets, 4.3 cm. high