The challenge with ruby and sapphire trafficking necessitates non-destructive determination method for prompt identification of theirextraction spot. The precious corundum extracted from eight world deposits have been examined by the pulsed cathode-luminescence method designed at IEP UB RAS. It has been shown that the spectra of all corundum samples have features specific to each region. On this basis, a statistical luminescent method for determining the region of origin of precious stones has been proposed and tested.

The method consists inanalyzing of the pulsed cathode-luminescence spectra of stones based on the difference in geochemical background between extracted from different. It was proposed to perform deposit identification using statistical parameters of the 550-900 nm luminescence band. It has been shown that the average wavelength, the width and relative intensity are normally distributed, but with the constants that differ significantly for each deposit.