Top to bottom, Tiffany & Co. Blue Book Collection emerald ring with diamonds set in platinum and gold; emerald ring with white and yellow diamonds set in platinum and gold; and emerald ring with diamonds set in platinum

Top to bottom, Tiffany & Co. Blue Book Collection emerald ring with diamonds set in platinum and gold (£325,500); emerald ring with white and yellow diamonds set in platinum and gold (£183,000); and emerald ring with diamonds set in platinum (£203,500).

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