Like Diamond, Ruby and Emerald, Sapphire is one of the so-called ‘big four’ gemstones and while we often think of it as blue, this member of the corundum family can in fact be found in almost any colour. Blue Sapphire is the birthstone for September and also the gem for the 45th wedding anniversary and 70th jubilees. It’s also the symbol of truth and nobility – often forming part of royal regalia.