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Depth of Color
The combination of tone and saturation that determines how noticeable a color is.

Fancy Color Diamond
A diamond with an attractive natural bodycolor other than light yellow or light brown.

HPHT
HPHT stands for high pressure, high temperature, and is a laboratory process which can be used to change the color in some gem diamonds. HPHT treatment can change the color of certain Type IIa diamonds, making them colorless, pink or blue. HPHT can also change certain Type Ia diamonds to green, yellowish green, or yellow. Type IIa diamonds are very rare in nature. They make up less than 2 percent of diamonds mined. On the other hand, type Ia diamonds are the most abundant kind of diamond in nature.

Hue
Pure, spectral (prismatic) color. Hues include gradations and mixtures of red, organe, yellow, green, blue, violet and purple.

Irradiated Diamond
A diamond which has been exposed to radiation.

Master Stones / Master Set
A set of color comparison diamonds that defines diamond color grades in the normal (D-to-Z) range.

Near Colorless
A general term for diamonds in the G-to-J color range.

Normal Color Range
Range of diamond colors from colorless to light yellow and light brown.

Saturation
A color's position on a neutral to vivid scale.

Tone
A color's position on a colorless-to-black scale.

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