| 摘要 |
<p>The present invention relates to a method for the separation of colourless untreated natural diamonds from:
a) colourless diamond imitations;
b) colourless treated natural diamonds;
c) colourless untreated synthetic diamonds and
d) colourless treated synthetic diamonds;
comprising:
a step A of removing the colourless diamond imitations; and
a step B of removing the colourless diamonds which are suspected to be treated natural diamonds, untreated synthetic diamonds or treated synthetic diamonds;
wherein said step A is carried out (13) before said step B and using Raman Shift Detection (RSD), the diamonds having, at a predetermined wavelength (W e ), an emission signal, the intensity of which is lower than a predetermined value (V e ) being removed (11), and wherein said step B is carried out (14) using a UVc transmission measurement (UTM), the diamonds having, in a predetermined wavelength region (R a ), a transmission value V T which is higher than a predetermined value (V T' ), being removed (20). The invention also relates to an apparatus for carrying out this method.</p> |
