The results of various investigators attempting to color the diamond by radium radiation have not been entirely uniform and in the main were unsuccessful. Doelter1 classes diamond as the most difficult of all minerals to color, and reports for the most part failures or very slight coloring. On the other hand, Crookes2 obtained in a few cases bluish-green and sage-green colors and A. Miethe3 produced a yellow color from a colorless diamond in one instance.

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