D – Diamonds in the D-grade range are completely colourless. They are extremely rare and thus, the most valuable. If you choose a D-grade diamond, it is going to look perfect in every shape!
E-F – To the naked eye, the diamond is colourless, however an experienced gemmologist would be able to detect a slight hint of colour.
G-H – Colour is difficult to detect with the naked eye. The diamond is near colourless. Colour may be detected when placed next to a diamond of better grade. These diamonds are of excellent value and ideal for a platinum or white gold setting.
I-J – Colour can be slightly detected by the naked eye. The diamond is near colourless and is of very good value. This is because once the diamond is set in jewellery, particularly in yellow gold jewellery, it can appear colourless.
K-M – Noticeable colour that is easily detected.
N-Z – Strong noticeable colour that is very easily detected by the naked eye.