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iamond is one of Earth's most extraordinary materials. It represents the pinnacle for several material and physical properties. As a gem, however, it is the near-perfect examples-diamonds attaining the D-Flawless distinction-and those with imperfections resulting in a vibrant or surprising color that create the most enduring impressions. Fancy-color natural diamonds are among the most highly valued gemstones due to their attractiveness and great rarity. The 18.96 ct Winston Pink Legacy, with a color grade of Fancy Vivid pink, recently made history by selling at over $50 million, its $2.6 million per carat price an all-time high for a pink diamond (Christie's, 2018). This article is the third in a series of studies on natural colored diamonds: Breeding et al. (2018) discussed the color origin of green diamonds, and Eaton-Magaña et al. (2018) dealt with blue/gray/violet diamonds. Here we summarize the color origin of orangy pink, purplish pink to pinkish purple, brownish pink to pinkish brown, pink, red, purple, and unmodified brown diamonds. Although this article covers a wide variety of color descriptions compared to, for example, the first article in the series, which was limited to natural diamonds with only green as the

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