Fancy Yellow Diamond
White diamonds are most traditional; however, a diamond does not have to be just white. Fancy colored diamonds such as brown, yellow, green, and blue diamonds exist. Diamonds can be treated to get those colors as well. Natural fancy colored diamonds range in price and quality. Natural radiation or the mixture of elements in the Earth cause different colors. The more rare a color and size corresponds with more value. The best resource for understanding more about them is the GIA.