Abstract: The present invention includes the steps of: storing data such as the symmetry, the variation degree in the area, the displacement of a tip portion, the depth of a slit, the shoulder widths, and the like of eight heart marks and the symmetry, the variation degree in the area, the displacement or sharpness of an arrow tip, and the like of eight cupid marks into a computer database; and performing arithmetic processing of the data and ranking determination of the quality of the heart marks and the cupid marks. It is an object of the present invention to provide a method and device capable of objectively determining the quality on the basis of the same determination criterion using determination software in both of a case where the diamond is directly imaged by a CCD camera.

Abstract: The invention includes: a barcode for reading a management number and measurement inspection company information of a polished mined diamond; a two-dimensional code for reading 4C information bound to the management number, the size information of the diamond, and optical virtual reflected images in the respective cases of the presence and absence of a color filter of the diamond created by CG software; and a field for outputting and displaying the 4C information output and displayed from the two-dimensional code and a size display field of the diamond, wherein the optical virtual reflected image in the absence of the color filter and the optical virtual reflected image in the presence of the color filter are output and displayed from the two-dimensional code and the computer database.

Abstract: The present invention includes the steps of: storing data such as the symmetry, the variation degree in the area, the displacement of a tip portion, the depth of a slit, the shoulder widths, and the like of eight heart marks and the symmetry, the variation degree in the area, the displacement or sharpness of an arrow tip, and the like of eight cupid marks into a computer database; and performing arithmetic processing of the data and ranking determination of the quality of the heart marks and the cupid marks. It is an object of the present invention to provide a method and device capable of objectively determining the quality on the basis of the same determination criterion using determination software in both of a case where the diamond is directly imaged by a CCD camera.