Diamond Properties : Color

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 as more yellow hue is detectable, while intense pink or blue diamondscan be dramatically more valuable.

Diamond is as a colorless stone. But color in diamond exists in myriad variations, from dazzling pinks and yellows to blues and violet. A chemically-pure, perfect crystal of diamond is colorless, but add a little nitrogen and yellow appears. Add boron instead and a blue diamond results. Colors from red to violet, real white, and black are possible and can be complex to understand scientifically. Colored diamonds are hot, both in the marketplace and in science.

To understand color in diamond, one must remember that light is a form of energy. In this representation of the visible spectrum, low energy is at the bottom and high energy at the top. Each color of the rainbow corresponds to a particular energy. When the energy of light entering a diamond equals the amount needed to bump an electron to another configuration, parts of the spectrum are absorbed.

A pure diamond is colorless because visible light lacks sufficient energy to excite any of its electrons and therefore no light is absorbed. However, impurities like nitrogen, boron or hydrogen, as well as structural flaws, can create electron states which can be effected by the energy in visible light. In the diamond pictured above, the higher energies of violet and blue light are subtracted from white light making the diamond appear yellow.

Gemologists have developed rating systems for fancy colored diamonds, but they are not in common use due to the relative rarity of colored diamonds. More information about diamond color.

Other Properties of Diamond.