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PORTUGAL - MARCH 26: Queen Elizabeth II attends a State Banquet in Portugal wearing the Crown Amethyst Suite of Jewels which originally belonged to Queen Victoria's mother. The Tiara, known as 'Granny's Tiara' is made of diamond festoons, scrolls and collet spikes. (Photo by Tim Graham/Getty Images)

PORTUGAL - MARCH 26:  Queen Elizabeth II attends a State Banquet in Portugal wearing the Crown Amethyst Suite of Jewels which originally belonged to Queen Victoria's mother. The Tiara, known as 'Granny's Tiara' is made of diamond festoons, scrolls and collet spikes.  (Photo by Tim Graham/Getty Images)