Computer-implemented method of and system for teaching an untrained observer to evaluate a gemstone

A computer readable medium comprising a computer program for teaching a user to evaluate a gemstone, the program being configured to execute a procedure comprising:

• presenting, on a display, a series of pre-stored screens comprising a graphical representation how a cut of a gemstone affects its light handling ability;
• processing a received image of a gemstone to determine one or more optical properties of the gemstone;
• and
• presenting, on the display, the received image of the gemstone and representations of the determined one or more optical properties.

A system for teaching a user to evaluate a gemstone, such as a cut diamond, the system comprising:

• an apparatus arranged to capture an image of a gemstone;
• a computer system configured to:
• present, on a display, a series of pre-stored screens comprising a graphical representation of how the cut of a gemstone affects its light handling ability;
• process an image of a gemstone received from the apparatus to determine one or more optical properties of the gemstone;
• and
• present, on the display, the received image of the gemstone and representations of the determined one or more optical properties.