In describing colored gemstones, the major factors influencing color are hue (position of a color on a color wheel), lightness ... Yet many of these descriptions deal only with the identification of ...

Subjects covered include the language of colored stones; color’s powerful role in gemstone value and the unique characteristics of popular colored stones; and how color, clarity, cut, and carat weight ...

Tetrachromacy, otherwise known as 'supervision', is a condition which allows people to see 'invisible' colors.

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Moreover, gemstone identification requires particular expertise ... A certified gemologist can distinguish between natural, synthetic, or imitation stones by examining characteristics like inclusions, ...

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