Jewellery can mean many things to many people. Take engagement rings - much more than the value of their constituent parts, they become imbued with emotional weight too.
Read MoreGrace Kelly, who was given not one but two Cartier engagement rings by her Prince charming, Prince Rainier of Monaco. The first was a ruby and diamond eternity band and the second a large solitaire - over 10 carats. It was this one that she refused to ever take off, making it perhaps the most famous engagement ring in the world.
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