Diamonds are characterized based on 4 Parameters â€“ Cut, Colour, Clarity and Carat. However, there are no proper quantitative measures for grading the diamonds for 3Cs such as Cut, Color and Clarity.
It is important to develop reliable and accurate systems to measure diamond’s brilliance based on 4Cs – Cut, Color, Clarity and Carat. While the quality of diamond based on Carat is easily evaluated by its weight, there are no proper quantitative measures for grading the diamonds for 3Cs such as Cut, Color and Clarity. Cut is the most important of the 4Cs because it has the greatest influence on a diamond's sparkle. When a diamond is cut too shallow or deep, the light leaks out from bottom or side which results in less sparkle in either case. Color is the second most significant parameter of 4Cs and refer to its lack of color – less color, higher the grade. Carat is easily measured based on the weight of the gemstone, not by its size, using weighing balance. Finally, clarity is judged based on tiny visible imperfections – less visible the imperfections, higher the clarity. Among the 4Cs used, the Cut, Color and Clarity are relative parameters. While the highest grade of Cut is realized by its sparkleness, the evaluation of Color and Clarity are subjective and identified based on relative scale by certified gemologists, third party laboratory, using light microscopy at 10X magnification. Due to subjective nature, the perception value of gemstone is expected to vary in market. The challenge is to develop equipment which can check the 3Cs of diamonds from size 0.7mm onwards, on a continuous line. Therefore, we seek suitable solution to resolve the challenges, as described above.