The PGI is also further able to narrow down the overlapping gemstones with similar thermal conductivity, by using the color separation
function.
After getting the test results, users are still able to revise the color of the gemstone by selecting “Color” if they will like to revise their
chosen choice of color, without repeating the thermal conductivity testing.
For the full list of gemstones and colors that can be tested, please see Fig. 3.4.
WARNING: Please note that the list of gemstones colors chart provided are based on the general colors descriptions as stated and
serves only as a guide. There is no known standard color charts for gemstones if unsure, please check with a gemologist.
Gemstone Name Red Pink Orange Brown Yellow Green Blue Violet Purple White Black Colorless
Glass Red Pink Orange Brown Yellow Green Blue Violet Purple White Black Colorless
Iolite Blue Violet Purple
Almandine Red Violet Purple
Pyrope Red Purple
Spessartite Red Orange Yellow
Fig. 3.4
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