THE PORTLAND ANTIQUE SAPPHIRE, DIAMOND AND NATURAL PEARL TIARA. Designed as a series of twelve graduated cushion-shaped sapphire and old-cut diamond clusters to the openwork frame of diamond-set swag and husk motifs, embellished with bouton-shaped pearls and diamond line borders to the pear-shaped pearl finials and sapphire collet accents, mounted in silver and gold, circa 1890, inner circumference 54.0cm. Ivy Cavendish-Bentinck, Duchess of Portland, wearing the tiara.
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