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| | Diamond properties, geology, exploration, mining, use - Part VII |
 | | The coloring of many diamonds is so faint that an unpracticed observer, unless he is able to compare such a stone with an absolutely colorless diamond or to place it against a background of pure white, will fail to recognize that the stone is colored at all. |
 | | Diamonds of a fine green color are distinctly rare, only a few Examples being known; the same may be said of red diamonds and, even more emphatically, of blue diamonds. |
 | | Several Examples of beautifully transparent rose-red diamonds are known; such, for instance, as that of the fifteen-carat stone belonging to the Prince of Riccia, a few smaller specimens in the treasury at Dresden, and a thirty-two-carat stone, the most beautiful rose-red known, in the treasury of Vienna. |
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