What is Diamond Colour? Following cut, colour is acknowledged as the second most important diamond characteristic and refers to the yellow or brownish tint running through most diamonds. This tint is caused by traces of nitrogen atoms trapped within the diamonds atomic structure. Diamond colour is graded from D (colourless) to Z (light yellow), and can affect the price of a diamond – D being the most desired and costly grade. At Hearts of London, we recommend sticking between D and F, which is considered the ‘colourless’ range, meaning differences in colour between D and F will be practically negligible. During a consultation at Hearts of London, we’ll show you a range of colour grades to demonstrate how visible this is to the naked eye – any further down the scale the H, and you’ll be able to start seeing the undesirable yellowish tints than can spoil a diamond’s lustre. Selecting a diamond that has a slightly lower colour grade can provide a significant saving and the colouration can often be disguised by selecting a stone with a ‘good’, ‘very good’ or ‘excellent’ cut, especially when the diamond exhibits weak or medium strength fluorescence. Of course, not all diamonds are created colourless – the gems can be naturally found in, and enhanced to, a range of colours – intense yellows, pinks, greens, blues, black, and so on. These are referred to as ‘fancy colours’, which are typically more rare and valuable the stronger the colour. If you are interested in viewing fancy coloured diamonds or other coloured gemstones, get in touch to meet with one of our experts and begin the search for the perfect stone.