Purple is the color of royalty for a reason.

Kate Middleton attended the London premiere of “Digger” Tuesday, looking radiant in a custom purple long-sleeved Jenny Packham gown.

The design featured sheer, voluminous sleeves and the Princess of Wales, 44, pulled her hair into an elegant half-up style that cascaded into waves and showed off her beloved Collingwood pearl drop earrings.

But the real star of her ensemble might’ve been the Queen Mother’s Amethyst Sautoir Necklace, a dazzling piece of jewelry that has rarely been seen in the public.

The necklace features of pearls alongside diamonds and amethyst, all framing a heart-shaped gemstone…

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