The quality of blank crystal is difficult to distinguish. Different suppliers of the raw materials, different cutting and/or polishing companies, different chemical contents differ the crystal quality in thousands ways. Air bubble, scratch, ripple, impurity, size tolerance, angle tolerance is easy to inspect, but the chemical content, transparency, definition, smoothness and the equitability of substance inside are difficult to measure. The blank crystals with superior quality will make the engraving graphics more clear and visional and fantastic, those with inferior quality will affect the final engraving effect. Especially the pressing type crystal, some parts of the image can not be engraved completely inside the crystal, which waste your time and money.
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