Favorite Colored Stone/Pearl Celebrity/Public Figure Engagement Rings & Jewels? PICS!

Princess Anne's sapphire and diamond ring from Mark Phillips:
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care of: gettyimages
 
Lady Elizabeth Bowes-Lyons was originally proposed to with a (Montana/Yogo) sapphire surrounded by diamonds...
gracie_jewellery_queen_mom_engagement_ring.jpg

care of: graciejewellery
Looks like the Duchess of Cambridge's, doesn't it?