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1·Cutter must adjust the rough area carefully, to take the gray, blue and colorless out of its trichroism.

刀具必须调整粗糙地区认真，采取灰色，蓝色和无色出其。

2·Trichroism . As of now, no such treatment has been used successfully to lessen or remove color, that is why you can always be sure that they are not treated.

截至目前，没有这种治疗已被成功地用来减轻或消除的颜色，这就是为什么你总是可以确保他们未得到治疗。