Gemstone
color grading system for the Web
| Color description (GIA notation): |
very light |
light; |
light; vs greyish /brownish |
m light; strong |
m light; vs greyish /brownish |
m light; sl greyish /brownish |
medium; strong |
medium; vs greyish /brownish |
medium; sl greyish /brownish |
med dark; strong |
med dark; vs greyish /brownish |
dark |
| Red | ||||||||||||
| orangey Red |
n/a |
n/a |
n/a |
n/a |
n/a |
n/a | ||||||
| reddish Orange | ||||||||||||
| Orange |
n/a |
n/a |
n/a |
n/a |
n/a |
n/a | ||||||
| orangey Yellow |
n/a |
n/a |
n/a |
n/a |
n/a |
n/a | ||||||
| Yellow | ||||||||||||
| greenish Yellow |
n/a |
n/a |
n/a |
n/a |
n/a |
n/a | ||||||
| yellowish Green | ||||||||||||
| slightly yellowish Green |
n/a |
n/a |
n/a |
n/a |
n/a |
n/a | ||||||
| Green | ||||||||||||
| very slightly bluish Green | ||||||||||||
| bluish Green |
n/a |
n/a |
n/a |
n/a |
n/a |
n/a | ||||||
| very strongly bluish Green | ||||||||||||
| Green-Blue or Blue-Green |
n/a |
n/a |
n/a |
n/a |
n/a |
n/a | ||||||
| very strongly greenish Blue | ||||||||||||
| very slightly greenish Blue |
n/a |
n/a |
n/a |
n/a |
n/a |
n/a | ||||||
| Blue | ||||||||||||
| violetish Blue |
n/a |
n/a |
n/a |
n/a |
n/a |
n/a | ||||||
| bluish Violet | ||||||||||||
| Violet |
n/a |
n/a |
n/a |
n/a |
n/a |
n/a | ||||||
| bluish Purple |
n/a |
n/a |
n/a |
n/a |
n/a |
n/a | ||||||
| Purple | ||||||||||||
| reddish Purple |
n/a |
n/a |
n/a |
n/a |
n/a |
n/a | ||||||
| strongly purplish Red | ||||||||||||
| slightly purplish Red |
n/a |
n/a |
n/a |
n/a |
n/a |
n/a | ||||||
| Grey |
n/a |
n/a |
n/a |
n/a |
Placing the cursor over the top right corner of the pattern displays the color ID, description and web RGB code.
|
Comments Gemval color grading system is a simplified modification of the Gemological Institute of America (GIA) color grading standards for natural gemstones. This simplified model is aimed primarily at online gemstone traders, auction dealers and gem collectors. The difference and the most important features of Gemval color grading system are: - Unlike GIA's standard color set, Gemval web color communication system is designed to fit a 32-bit LCD computer monitor precisely and specifically to enable color recognition via a web interface. For your convenience each pattern refers both to the GIA color scale and to the web color code (RGB code). - The most interesting and unique feature of the system is a "minimal value gap" modelling. This means we have kept the highest level of detail in color areas, which have the greatest impact on a gem's value, and we have reduced the color precision scale for areas of unsaturated / dark colors, usually applicable to inexpensive gemstone varieties. Therefore the system assures minimal value estimation error. - The color grade system represents the core of Gemval online appraisal system. It consists of 230 color patterns, 25 base hue sets + grey scale, extended by 6 tones (very light, light, medium light, medium, medium dark, dark) and by 3 saturation grades (strong, very slightly greyish/brownish, slightly greyish/brownish). |
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