Abstract: A system for identifying jewels comprises an automatic microscope 2, an automatic image-analyzing apparatus 3, an electric-resistance measuring apparatus 4, a weighing apparatus 5, a spectroscopic-analysis apparatus 6, and an electronic information processing apparatus 7. The microscope 2 forms an enlarged image of an identification number 11d marked on a jewel to be identified. The image-analyzing apparatus 3 receives the image of the identification number 11d from the microscope 2, and analyzes it. The measuring apparatus 4 measures the electric resistance between spots 11a and 11b marked on the jewel. The weighing apparatus 5 determines the specific gravity of the jewel to the nearest 0.001 gram. The spectroscopic-analysis apparatus 6 directs a beam of light of particular band on a spot 11c marked on the jewel, and determines the spectrum of the light reflected from the spot 11c.