Gemstone color grading system for the Web

 Color description
 (GIA notation):
very light

light;
strong

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 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).

Standard gemstone values

Historical values and trends

Color grading system for natural opals

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