Gemstone colour grading process and grading system

A process of assigning a colour grade to a diamond, said process including the steps of:

• (i) determining the optical absorbance in the visible light spectrum of a diamond;
• (ii) comparing the optical absorbance of said diamond with previously acquired data set from a plurality of diamonds each having a colour grading previously assigned thereto, and
• (iii) assigning a colour grade to the diamond upon a correlation of the optical absorbance of said diamond with a grade of said previously acquired data set;
• wherein said previously acquired data set comprises a correlation between N3 and C center content and optical absorbance in the visible light spectrum for each diamond of said plurality of diamonds.

A process operable using a computerized system for grading the colour of a diamond, the computerized system including a processor module and an output module operably interconnected together, said process including the steps of:

• (i) acquiring data indicative of the N3 and C center content of a diamond from an Electron Paramagnetic Resonance (EPR) device;
• (ii) in a processor module comparing data derived from the Electron Paramagnetic Resonance (EPR) device, with a plurality of data sets each of which corresponds to a diamond of a plurality of diamonds, wherein said data sets are previously acquired data comprises a correlation between N3 and C center content and optical absorbance in the visible light spectrum for each diamond of said plurality of diamonds;
• and
• (iii) from an output module, responsive to a predetermined threshold of correlation between the data derived from input of the Electron Paramagnetic Resonance (EPR) device and one of the plurality of data sets from step (ii), an output signal is provided indicative of the colour grade of the diamond.

A process operable using a computerized system for grading the colour of a diamond, the computerized system including a processor module and an output module operably interconnected together, said process including the steps of:

• (i) acquiring data indicative of the optical absorbance in the visible light spectrum of a diamond from a light absorbance device;
• (ii) in a processor module comparing data derived from the light absorbance device, with a plurality of data sets each of which corresponds to a diamond of a plurality of diamonds, wherein said data sets are previously acquired data comprises a correlation between N3 and C center content and optical absorbance in the visible light spectrum for each diamond of said plurality of diamonds;
• and
• (iii) from an output module, responsive to a predetermined threshold of correlation between the data derived from input of the light absorbance device and one of the plurality of data sets from step (ii), an output signal is provided indicative of the colour grade of the diamond.

A system for grading the colour of a diamond, said system comprising:

• (i) an input module for receiving data acquired indicative of the N3 and C center content of a diamond from an Electron Paramagnetic Resonance (EPR) device;
• (ii) a processor module for comparing data by the input module derived from the Electron Paramagnetic Resonance (EPR) device, with a plurality of data sets each of which corresponds to a diamond of a plurality of diamonds, wherein said data sets are previously acquired data comprises a correlation between N3 and C center content and optical absorbance in the visible light spectrum for each diamond of said plurality of diamonds;
• and
• (iii) an output module, which responsive to a predetermined threshold of correlation between the data derived from input of the Electron Paramagnetic Resonance (EPR) device and one of the plurality of data sets from the processor module, provides an output signal indicative of the colour grade of the diamond.

A system for grading the colour of a diamond, said system comprising:

• (i) an input module for receiving data acquired indicative of the optical absorbance in the visible light spectrum of a diamond from a light absorbance device;
• (ii) a processor module for comparing data derived from the input module from the light absorbance device, with a plurality of data sets each of which corresponds to a diamond of a plurality of diamonds, wherein said data sets are previously acquired data comprises a correlation between N3 and C center content and optical absorbance in the visible light spectrum for each diamond of said plurality of diamonds;
• and
• (iii) an output module, which responsive to a predetermined threshold of correlation between the data derived from input of the light absorbance device and one of the plurality of data sets, provides an output signal is provided indicative of the colour grade of the diamond.