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For the delicate stones and semi precious stones with lighter color, the inclusion characteristics of the turquoise precious stone can be observed by the instrument. The heat precious yellow precious stone may have annular cracks and burnt filamentous inclusions. The annular ribbon around the semi precious stone is mainly for the deeper jade semi precious stone. The deeper green precious gemstones are removed by this heat treatment to remove some dark tones. This effect is generally not as good as producing blue. The effect is good.
