We recently added to our journal a post on the cut of diamond and here we follow on to explain a little about the colour of a diamond. It was the GIA (Gemmological Institute of America) that standardised the diamond grading system that is now internationally recognised and used though out the diamond markets and jewellery trade. They wanted to distinguish their new grading system from any others that were utilised before hence their colour grading begins with the letter D and leads to the letter Z. Past the letter Z is a whole other scale to explain the fancy coloured diamonds but that would be a different blog post altogether.
D is the purest of colourless diamonds, colours D E and F are known in the trade as collection colours. These colours are the crème de la crème of which you are often in awe when you see a stone of this colour as it is so captivatingly fresh. G H and I colour of diamonds are still up with the collection colour gods but are used more commercially as these are still regarded as ‘white stones’. From J and below you start to see colour tints becoming more and more yellow the further down the scale you go
Colour of diamonds are assessed from looking through the side of the stone because when you look through the top of the stone the sparkle can be somewhat distracting and the colour can appear better than what it actually is. Looking at the image below you can really see the colours coming out as you go further down the colour scale. We diamond graders use a master set of stones to compare colour of a diamond, in our possession and in very particular lighting. Most people cannot differentiate between one colour and the next one, a trained eye helps. Again this is why you need to trust your jeweller and what they are sourcing.