The GIA Colourless grading scale runs from D to Z. Different people are drawn to different colours along the scale, and as you travel down the alphabet, the diamond becomes less expensive. This diamond was chosen in order to achieve huge size on the finger. This is a GIA graded 2.55ct, M colour, VVS2 clarity, Hearts & Arrows cut diamond. When set into Yellow or Rose 18kt Gold, the colour is lightened, giving a warm and sparkly look at about 2/3 of the cost of a D-H colour diamond of the same siz