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10. Princess Margaret
If you haven't been able to tell by now, the royals love the non-diamond colorful jewels, and Princess Margaret is no exception. 

Though it's difficult to tell from this picture, Margaret's engagement ring, given to her by Antony Armstrong-Jones, featured a ruby surrounded by diamonds. The ring is meant to resemble a rosebud, which is in honor of Margaret's middle name of Rose.  

Margaret and Antony were married from 1960 to 1978.