EXCLUSIVE: Why Princess Diana's $500 Million Tiara Will Never Fall Into the Hands of Princess Kate or Meghan Markle

Despite its royal ties, Diana's iconic tiara will stay with the Spencer family.

Princess Diana’s most famous tiara may be one of the most recognizable pieces of royal jewelry in the world, but despite its close association with the late princess, the glittering heirloom is set to remain firmly out of reach of both Princess Kate and Meghan Markle.

Diana, who died aged 36 in 1997 in a Paris car smash, famously wore the Spencer tiara on her wedding day to the then-Prince Charles, now King Charles III, 76, on July 29, 1981.

The diamond-encrusted headpiece was paired with her iconic silk taffeta gown and 25-foot train, creating one of the defining images of modern royal history.

But there's one little-known detail about the tiara's ownership that keeps it firmly out of royal hands.