When Prince William got down on one knee to ask his long-term girlfriend to be his wife, he presented her with his late mother's engagement ring.
The sapphire and diamond band is one of the most famous pieces of jewellery in history, worn by both Princess Diana and Kate Middleton, who would become the Duchess of Cambridge.
But Kate wasn't always going to have the famous royal ring, and she only ended up wearing it thanks to a touching sacrifice from her future brother-in-law, Prince Harry.
After the death of their mother, Diana, in 1997 the boys were taken to choose a "keepsake" from her belongings in Kensington Palace, according to reports from a source close to the royals.
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