12-carat sapphire ring surrounded by 14 solitaire diamonds, set in 18-carat white gold
Price: $500,000
When Prince William proposed to Kate Middleton in 2010 he opted to pop the question with a precious family heirloom that belonged to his late mother Princess Diana. When Prince Charles proposed to Diana, he presented her with a selection of rings to choose from, and she opted for the now-legendary sapphire stunner. The ring was purchased for $40,000 in 1981, it is now estimated to be worth $430,000.
22. Amal Alamuddin
7-carat emerald-cut platinum diamond ring
Price: $750,000
Although we were finally coming to terms with the fact that George Clooney, 52, was an eternal bachelor, he managed to totally shock everyone when she decided to settle down with stunning lawyer Amal Almuddin – and he made the engagement official with a ginormous sparkler!