Natural Pink Diamonds
Natural Champagne Diamonds
Natural Black Diamonds
Natural White Diamonds
Natural Yellow Diamonds
Natural Red Diamonds
Natural Blue Diamonds
Natural Green Diamonds
Natural Orange Diamonds
Natural Purple Diamonds

Almost all natural diamonds contain small traceable quantities of nitrogen atoms that displace the carbon atoms within the crystals lattice structure. Nitrogen atoms dispersed throughout the stone create their yellow appearance. The lower the amount of nitrogen present within the diamond the whiter it will be. In determining the colour grading of a white diamond the Gemological Institute of America uses a scale of D to Z.
D, E, F colourless
G, H, I, J near colourless
K, L, M faint yellow or brown
N, O, P, Q, R very light yellow or brown
S, T, U, V, W, X, Y, Z light yellow or brown
Fancy Light the start of fancy coloured diamonds
Fancy
Fancy Intense
Fancy Vivid the highest saturation