Diamond. Adamas, the invincible; the unconquerable. The hardest substance on earth. Ice. Transparent carbon, without color, and without rival. Grade them D, E, or F, and you have a colorless diamond. These are the top grades in the Gemological Institute of America diamond grading scale. (No, there is no A, B, or C grade.) Colorless diamonds are transparent, and by definition have no visible color in the face-up position. Near-colorless diamonds have no visible color face up but do have a very slight suggestion of color—yellow, brown, or gray—visible through the pavilion. These stones are given the letter grades G, H, I, or J. Colorless and near-colorless diamonds are rare. Mother Nature will more often grow diamonds with impurities that add visible tints of yellow, brown, or gray. And in fact, diamonds can grow in all the hues of the rainbow, as well as black and white. That make

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