RAPID IDENTIFICATION METHOD OF ARGYLE DIAMOND'S ORIGIN BY CHARACTRISTIC RAMAN SPECTRA

摘要

A rapid identification method of Argyle diamond's origin by characteristic Raman spectra, comprising steps of:providing a Raman spectrometer to collect Raman spectra of multiple sample diamonds under conditions of 785 nm laser excitation, 450mw laser power, 250 - 2350 cm- 1 Spectral Range, spatial resolution 100 µm, and 0.2-3 seconds integration time; andthe sample diamonds being identified as type A and type B on the basis of diagnostic features of Raman raw spectra;wherein Raman raw spectra of type A diamonds showing diamond's C-C bonds at 1332 cm-1 protrude on a convex-shaped background, and when raw data of type A diamonds are processed by a background correction and normalization program, eight distinctive peaks at 640 cm-1, 832 cm-1, 952 cm-1, 1012 cm-1, 1225 cm-1, 1834 cm-1, 1940 cm-1, 2120 cm-1 are shown up in the spectrum, in addition to the C-C mode at 1332 cm-1, the eight peaks being interpreted as fluorescent peaks excited by the incident near-infrared 785 nm laser beam and defining the type A diamonds as Argyle pink diamonds; and when Raman raw spectra of type B diamonds are processed by the background correction and normalization program, eight distinctive peaks at 302 cm-1, 339 cm-1, 640 cm-1, 952 cm-1, 1012 cm-1, 1250 cm-1, 1273 cm-1, and 1565 cm -1 are shown up in the spectrum of type B diamonds, whereby defining type B diamonds as Argyle pink diamonds.