Unlike diamonds where the cut is one of
The GIA specifies and labels up to thirty one gemstone hues. Unlike diamonds, where the cut is one of the important factors, the colour of coloured gemstones such as emeralds, rubies, sapphires, and tanzanite can influence as much as fifty percent of gemstones value.Gemstone Colour Grading Basics Gemstone colour grading is broken into three quantifiable categories intensity saturation, hue colour, and tone lightnessdarkness. The hue is the actual colour of the material blue, green, red, etc..Gemstone Hue Chart The GIA nomenclature also specifies six levels of saturation ranging from grayish neutral grey to moderately strong to vivid.
Taken together, these three parameters will provide simple numeric code that can quickly and accurately quantify gemstone colour. Using Kashmir or Cornflower blue sapphire as an example, in order to receive quality rating, the stone would posses violetblue hue, with or medium dark tone and or vivid saturation.. Unlike diamonds, where the cut is one of the important factors, the colour of coloured gemstones such as emeralds, rubies, sapphires, and tanzanite can influence as much as fifty percent of gemstones value.Gemstone Colour Grading Basics Gemstone colour grading is broken into three quantifiable categories intensity saturation, hue colour, and tone lightnessdarkness.
TourmalineTopaz, CitrineTanzanite, Zircon, TurquoiseColoured Gemstone GradingColour Gem Grading & Valuation Comprehensive color grading is an extremely important factor in determining the value of coloured gemstones. Unlike diamonds, where the cut is one of the important factors, the colour of coloured gemstones such as emeralds, rubies, sapphires, and tanzanite can influence as much as fifty percent of gemstones value.Gemstone Colour Grading Basics Gemstone colour grading is broken into three quantifiable categories intensity saturation, hue colour, and tone lightnessdarkness. The GIA specifies and labels up to thirty one gemstone hues. The hue is the actual colour of the material blue, green, red, etc..
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