Patent ID: 9581553
Date: 2017-02-28
CPC Classifications: G01N

Claim:
1. An examination method for distinguishing between natural and synthetic CVD/HPHT diamonds, comprising: providing a Raman spectrometer having a laser beam of wavelength 785 nm and total laser energy of 450 mW for an average detection of diamond surfaces; three continuous scans being performed using a tailor-made probe having a large facula and surface area to obtain three spectra, from which an average Raman spectra is determined; defining a collection range of the spectrometer as 250-2800 cm after the collection of the Raman spectral data, the intensity being subjected to two operations: (a) correction and standardization, and (b) background elimination that result in a Raman spectrogram with a smooth baseline and a calibrated intensity; wherein a carbon Raman characteristic peak for diamonds occurs at 1332 cm