Patent ID: 11906437
Assignee: UNIVERSITà DEGLI STUDI DI MILANO - BICOCCA
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. The method of claim 7, further comprising:
if, as a result of the fourth analysis, the intensity peak of approximately 884 nm is determined to be absent, proceed with verifying whether the gem emits a phosphorescence signal in a visible spectral region, wherein verifying whether the gem emits a phosphorescence signal in the visible spectral region comprises:
deactivating the first light source and activating the second light source for a predetermined irradiation time, emitting the second primary beam toward the analysis position;
at an end of the predetermined irradiation time, deactivating the second light source and, after a first time from deactivation, acquiring a phosphorescence signal using the second photodetector device; and
analyzing the phosphorescence signal to determine whether phosphorescence intensity at a first wavelength in the visible spectral region, greater than or equal to 400 nm and less than or equal to 600 nm, is greater than, less than, or equal to a phosphorescence intensity threshold value;
if, as a result of this fifth analysis, the phosphorescence intensity is determined to be greater than or equal to the phosphorescence intensity threshold value, establishing that the gem is a type II synthetic diamond and outputting an indication that the gem is a type II synthetic diamond; and
if, as a result of the fifth analysis, the phosphorescence intensity is determined to be less than the phosphorescence intensity threshold value, establishing that the gem is a type II natural diamond and outputting an indication that the gem is a type II natural diamond.