How do I know my size?
The best way to measure your ring size is at your local jeweller's which only takes a minute, it'll be professionally sized and it's free! If you can't make it to a jeweller's you can purchase a ring sizer from the 'rings' section and measure your ring size at home. They're complete with easy to follow instructions.
What if I'm buying a ring for someone else?
If you're buying the ring for someone else maybe ask their partner/relative if they know their ring size or sneak their ring to a jeweller's to have it sized (though make sure it's for the correct finger!).