A chemically pure and structurally perfect
diamond is perfectly transparent with no
hue, or
color. However, in reality almost no gem-sized natural diamonds are absolutely perfect. The color of a diamond may be affected by
chemical impurities and/or structural defects in the crystal lattice. Depending on the hue and intensity of a diamond's coloration, a diamond's color can either detract from or enhance its value. For example, most white diamonds are discounted in price when more yellow hue is detectable, while intense pink or blue diamonds (such as the
Hope Diamond) can be dramatically more valuable. Out of all colored diamonds, red diamonds are the rarest. The
Aurora Pyramid of Hope displays a spectacular array of naturally colored diamonds, including red diamonds.