| 摘要 |
A spectroscopic analysis method and apparatus for enabling the distinction of artificially treated coloured diamonds from natural coloured diamonds. By illuminating a diamond with an excitation wavelength of less than 675 nm, the occurrence of specific combinations of discrete photoluminescence features positioned at 681 nm (1), 705 nm (2), and at 725 nm (3) indicates artificial treatments in the examined diamond. In particular, a spectral pattern comprising either at least a spectral feature at 681 nm or at least the co-existence of spectral features at 705 nm and 725 nm is associated with an artificially treated diamond. The method and the apparatus are particularly useful to discriminate artificially treated brown-coloured, orange-coloured, and yellow-coloured diamonds. |
