At Goldsmiths we understand that before you start shopping around for that perfect diamond you need to have an understanding of what you are buying. We have put together this simple guide to assist you when choosing that special diamond purchase. There are four main criteria to consider when buying your diamond these are cut, colour, clarity, and carat weight also referred to as the 4C's – This will enable you to select your diamond based on the same criteria jewellers use to grade them.