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(Another option, of course, is that she just really liked the necklace.) While the sapphire sparkler hasn't been seen since Diana's tragic death, it has been reported that she had stipulated in her will that her sons would inherit nearly all of her jewelry, including her iconic engagement ring, so that their wives may, in due course, have it or use it. That would mean that it likely belongs to either Prince William or Prince Harry

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So choose your handsome date and make sure his outfit matches yours

Additionally, a single pearl pendant on delicate chain works great