A sapphire engagement ring is the perfect “something blue”, don’t you think? We’re still swooning over Kate Middleton’s beautiful heirloom. Other than the fact that it once belonged to Princess Diana, here’s some more info about the ring: the centre stone (an oval sapphire) is 18 carats, it is surrounded by 14 diamonds and it was made by Garrard Jewellers (the official Crown jewellers for the Royal Family since 1843. Want to get the look? We’ve rounded up a few beautiful options.