The research project aims at the development of a color communication system for gemstones by replacing the common color names such as pigeon blood red, cobalt blue, lemon yellow which cannot represent the true meaning of color with the standard color names that are used internationally in other industries such as textiles and printing. The gemstones used in this project were emerald, yellow sapphire, amethyst, garnet, topaz, tanzanite and pink sapphire. Altogether seventeen sets of standard gemstones weighing from 0.75 to 1 carat were obtained by careful selection based on three criteria : attractive color, brilliance and transparency. The quality and authenticity of the standard gemstones were also determined by the following instrumentation procedures: refractometer, microscope, UV-VIS-NIR spectrophotometer and EDXRF spectrometer. Each master stone set is color matched to Munsell color chips in the standard lightbox Gretag Macbeth model The Judge II, color temperature 5000 K. The illuminance at the study area is 1200 lux. The Munsell color code of each master stone is transformed into the color preference survey. The information obtained indicates significant differences in color preference among people of different nationalities (Thai, european, American, Australian, African and other Asians).

    In normal practice, GIT uses these standard sets of gemstones and their color codes and names as master standard gemstones to conduct subjective color matching and grading with customer's gemstones.

    The visual Munsell color description was correlated with instrumental measurement of a color by using a spectrophotometer. The results of the new gemstone grading system are accurate enough to satisfy a scientist and usable enough to satisfy manufacturers and traders. The results of this research help enhance the standard and quality of the Thai gem and jewelry industry and are useful in marketing and export.

 
       

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