FIELD: chemistry.
SUBSTANCE: method involves collecting a control sample of cleaned crystals of natural diamonds and determining impurities. After cleaning, absorption spectra of the diamond crystals of the control sample are recorded, followed by determining in an information array the colour of diamond crystals and content in the control sample of diamond crystals with different type of impurities before and after cleaning. Cleaning efficiency is determined from the ratio of the number of cleaned crystals t the number of diamond crystals with impurities before cleaning, expressed as a percentage.
EFFECT: invention increases efficiency and accuracy of controlling the cleaning process.
1 tbl
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