Diamond Colour Chart

Except in the case of fancy diamonds,where vivid colours are preferred,the most prized diamonds are colourless and grading a diamond optimistically is a fine way to improve margins.I use the chart above to judge colour. Ideally diamonds should be colour graded before setting them because the metal colour is taken up by the set stones.A good workaround to the problem is to wear a diamond of the grade you wish to purchase set in the metal of choice and compare with the gemstones in the piece you wish to buy.This way the effect of different colour lights can be controlled too.Slightly yellowish stones might not show on yellow gold but why pay more for them?