There are many things to take into consideration when purchasing a yellow diamond. Yellow diamonds are considered Fancy Colored diamonds, and therefore very rare. Only about 1 in every of 16,500 carats that are mined are yellow diamonds. Amongst these diamonds, there is a spectrum of saturation and vividness of color that contributes to making a yellow diamond more or less valuable. These color grades in order of value are: Fancy Light, Fancy, Fancy Dark, Fancy Deep, Fancy Intense, and Fancy Vivid. And as you can imagine, there is a huge difference in worth between yellow diamonds graded Fancy Light Yellow versus diamonds with a grade of Fancy Vivid Yellow.