Abstract: A spectroscopic analysis apparatus may include: a sample holder to retain a gem in analysis position; a first light source configured to emit a first primary beam at an excitation wavelength toward the analysis position to generate emission or diffusion of light; a second light source configured to emit a second primary beam comprising UV light toward the analysis position to impact on the first side; an optical focusing system to focus the light emitted or diffused by the first side in a secondary optical beam; a spectral dispersion device arranged to collect and spatially disperse the secondary optical beam; a first photodetector device arranged to collect the dispersed light and to output a distribution of spectral intensity as a function of emission wavelength; a second photodetector device to collect visible light transmitted through the gem; and a film of fluorescent material to UV light.

Abstract: The present invention relates to a spectroscopic analysis apparatus (10) for distinguishing between colorless gems, comprising: a sample holder (32) to retain a gem (13) in an analysis position exposing a first side of the gem and a second side thereof, opposite to the first side; a first light source (12) configured to emit a first primary beam (14) at an excitation wavelength between 600 nm and 680 nm directed towards the analysis position to impact on the first side of the gem, when it is positioned in the sample holder, and to generate emission or diffusion of light; a second light source (31) configured to emit a second primary beam (14?) comprising ultraviolet light (UV), the second primary beam being directed towards the analysis position to impact on the first side of the gem; an optical focusing system (30) to focus the light emitted or diffused by the first side of the gem in a secondary optical beam (15); a spectral dispersion device (22) arranged to collect the secondary optical beam (15) downs

Abstract: A method of spectroscopic analysis of a diamond for determining whether the diamond has been artificially treated to change its colour may include: generating light emission from a diamond upon optical excitation at a wavelength equal to or smaller than 680 nm; optically producing a dispersed light emission; detecting the dispersed light emission across a collected spectral region including emission wavelengths of from 670 nm to 735 nm; processing the output signals to produce a spectral intensity distribution as a function of emission wavelengths; analysing the spectral intensity distribution to determine the presence or absence of a spectral pattern including either an intensity peak at 681 nm or a combination of intensity peaks at respective wavelengths 705 nm and 725 nm; if a spectral pattern is present, establishing that the diamond has been treated; and if a spectral pattern is absent, establishing that the diamond has not been treated.

Abstract: A method of spectroscopic analysis of a diamond for determining whether the diamond has been artificially treated to change its colour may include: generating light emission from a diamond upon optical excitation at a wavelength equal to or smaller than 680 nm; optically producing a dispersed light emission; detecting the dispersed light emission across a collected spectral region including emission wavelengths of from 670 nm to 735 nm; processing the output signals to produce a spectral intensity distribution as a function of emission wavelengths; analysing the spectral intensity distribution to determine the presence or absence of a spectral pattern including either an intensity peak at 681 nm or a combination of intensity peaks at respective wavelengths 705 nm and 725 nm; if a spectral pattern is present, establishing that the diamond has been treated; and if a spectral pattern is absent, establishing that the diamond has not been treated.