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An Art Deco ruby, sapphire and diamond ring, first half 20th century, of 'day and night' design, set
An Art Deco ruby, sapphire and diamond ring, first half 20th century, of 'day and night' design, set with a continuous band of calibré-cut rubies and sapphires, between two hinged half hoops set with single-cut diamonds, mounted in platinum, size O