Commissioned by Napoleon I in 1810 for his second wife, Marie Louise of Austria, this diadem of 79 emeralds and more than 1,000 diamonds outlived an empire.
http://orderofsplendor.blogspot.com/2014/03/tiara-thursday-marie-louise-diadem.html
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13 Of The Most Valuable Jewels In the World - 12th Princess Diana's Sapphire Engagement Ring
Educational1 CommentLady Diana Spencer's engagement ring, a 12-carat blue Ceylon sapphire edged by 14 solitaire diamonds in 18k white gold, became one of the most copied designs ever.
https://en.wikipedia.org/wiki/Engagement_ring_of_Lady_Diana_Spencer