Portuguese Diamond

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The Portuguese Diamond is a large octagonal-cut diamond known for its flawlessness and clarity. It weighs 127.01 carats (25.402 g).^[1]

Under ultraviolet light the stone gives out a strong fluorescence; under daylight or artificial light, it exudes a soft fluorescence and a bluish haze.

The name "The Portuguese Diamond" was given by Harry Winston, who acquired it from dancer Peggy Hopkins Joyce, noted for her many marriages and affairs with wealthy men. He in turn arranged a 1963 trade with its current owner, the Smithsonian Institution, for 3,800 carats (760 g) of smaller diamonds. ^[1]