Systems and methods here may be used for analyzing images of gemstones to automatically assign a haziness and/or fluorescence grade to the gemstone using contrast analysis on pixelated, digital images of the gemstones.

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) downstream of the optical focusing system (30) and configured to spatially disperse the secondary optical beam (15); a first photodetector device (24) arranged to collect the light dispersed by the spectral dispersion device (22) and configured to output a distribution of spectral intensity as a function of the emission wavelength in a range of emission wavelengths included within the range between 660 nm and 900 nm; a second photodetector device (37) to detect visible light arranged in front of a second side of the gem, so as to collect light transmitted through the gem; a film of fluorescent material (39) to UV light able to be positioned in a first position between the second side of the gem and the second photodetector device (37) to detect fluorescence and in a second position external to the field of view of the second photodetector device (37); a central processing unit (36) connected to the first and to the second photodetector device (24, 37), to the first (12) and to the second light source (31), the central processing unit (36) being configured to: activate the first light source (12) to emit the first primary beam (14) towards the analysis position; acquire the distribution of spectral intensity from the first photodetector device (24) as a function of the emission wavelength; analyze (102) the distribution of spectral intensity to determine the presence or the absence of a Raman intensity peak at a wavelength corresponding to a difference in wave number

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) downstream of the optical focusing system (30) and configured to spatially disperse the secondary optical beam (15); a first photodetector device (24) arranged to collect the light dispersed by the spectral dispersion device (22) and configured to output a distribution of spectral intensity as a function of the emission wavelength in a range of emission wavelengths included within the range between 660 nm and 900 nm; a second photodetector device (37) to detect visible light arranged in front of a second side of the gem, so as to collect light transmitted through the gem; a film of fluorescent material (39) to UV light able to be positioned in a first position between the second side of the gem and the second photodetector device (37) to detect fluorescence and in a second position external to the field of view of the second photodetector device (37); a central processing unit (36) connected to the first and to the second photodetector device (24, 37), to the first (12) and to the second light source (31), the central processing unit (36) being configured to: activate the first light source (12) to emit the first primary beam (14) towards the analysis position; acquire the distribution of spectral intensity from the first photodetector device (24) as a function of the emission wavelength; analyze (102) the distribution of spectral intensity to determine the presence or the absence of a Raman intensity peak at a wavelength corresponding to a difference in wave number

A method and apparatus detects an unknown deposit in soil of a known mineral or gemstone using characteristic scents of the mineral or gemstone. The method may disturb the soil, for example, by causing a chemical reaction in at least part of the soil such that a mineral or gemstone present in the soil emits a characteristic scent. The unknown deposit of the known mineral or gemstone can be detected in real-time or near real-time in the field.

A method and apparatus detects an unknown deposit in soil of a known mineral or gemstone using characteristic scents of the mineral or gemstone. The method may disturb the soil, for example, by causing a chemical reaction in at least part of the soil such that a mineral or gemstone present in the soil emits a characteristic scent. The unknown deposit of the known mineral or gemstone can be detected in real-time or near real-time in the field.

Systems and methods here may be used for a setup of fluorescence image capturing of a gemstone, such as a diamond placed on a flat stage. Some examples utilize a setup that both sends light and captures the image from the table side of the gemstone by passing ultraviolet (UV) light between 10 nm and 400 nm to the gemstone and capturing the excited fluorescence image for analysis through a dichroic beam splitter. In some examples, the cutoff is 300 nm. The dichroic beam splitter arrangement allows for the camera to focus on the same interface of the stage and gemstone over and over for ease of use and without moving, changing, or adjusting the equipment for different samples.

Systems and methods here may be used for a setup of fluorescence image capturing of a gemstone, such as a diamond placed on a flat stage. Some examples utilize a setup that both sends light and captures the image from the table side of the gemstone by passing ultraviolet (UV) light between 10 nm and 400 nm to the gemstone and capturing the excited fluorescence image for analysis through a dichroic beam splitter. In some examples, the cutoff is 300 nm. The dichroic beam splitter arrangement allows for the camera to focus on the same interface of the stage and gemstone over and over for ease of use and without moving, changing, or adjusting the equipment for different samples.

Provided herein is an apparatus for assessing a color characteristic of a gemstone. The apparatus comprises an optically opaque platform for supporting a sample gemstone to be assessed, a daylight-approximating light source to provide uniform illumination to the gemstone, an image capturing component, and a telecentric lens positioned to provide an image of the illuminated gemstone to the image capturing component. Also provided are methods of color analysis based on images collected using such an apparatus.

Provided herein is an apparatus for assessing a color characteristic of a gemstone. The apparatus comprises an optically opaque platform for supporting a sample gemstone to be assessed, a daylight-approximating light source to provide uniform illumination to the gemstone, an image capturing component, and a telecentric lens positioned to provide an image of the illuminated gemstone to the image capturing component. Also provided are methods of color analysis based on images collected using such an apparatus.

Users may provide images to the ring selection system via a ring selection interface of a client application. The ring selection system may analyze the images using one or more machine learning models to determine ring characteristics of rings depicted in the images. The ring selection system may determine a set of ring listings having the determined ring characteristics and display the set of ring listings in the ring selection interface.