We buy GIA, HRD & IGI certified diamonds. You only need to supply the certificate number and we can use that information to send a quote to you. In addition, we buy non-certified diamonds. While an approximate valuation in such cases can be made using information such as the carat weight, colour, clarity and cut of the diamond, we can deliver a precise quote if you visit us in our Hatton garden office. This is where we will analyse and asses the diamond in your presence and while you wait. Please note that we only purchase diamonds from 0.50ct and above for the centre diamond, whether that may be in a ring or other pieces of jewellery.