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Your Ultimate Guide To The Most Famous Royal Engagement Rings

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30. Alexandra, Countess Of Frederiksborg
There is no missing the round diamond on Alexandra Manley's (the Countess of Frederiksborg) ring, but if you look closely you'll also see the addition of rubies on either side. 

Alexandra was Prince Joachim of Denmark's first wife. They married in 1995 and divorced in 2005. They had two sons together.