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Annealing - ANSWERA gemstone heating process that can be used alone or to
stabilize irradiated color
Characteristic color - ANSWERThe basic face-up color of a colored diamond
Colored diamonds - ANSWERYellow, brown, and gray diamonds with more color
than the Z masterstone, or that exhibit any other color face-up
Depth of color - ANSWERThe combination of tone and saturation that determines
how noticeable a color is
Hue - ANSWERYour first impression of a color; the basic color of an object
Irradiation - ANSWERA treatment that changes the color of a gem by exposing it to
radioactive materials
Masterstones - ANSWERA set of color comparison diamonds that defines GIA's
diamond color grades in the normal (D to Z) range
Fluorescence - ANSWEREmission of visible light by a material when it's exposed to
ultraviolet radiation
Near-colorless - ANSWERA general term for diamonds in the G-to-J color range
Normal color range - ANSWERRange of diamond colors from color,see to light
yellow, brown, and gray
Saturation - ANSWERA colors strength or intensity, ranging from a dull hue to a
pure, vivid hue
Tone - ANSWERA colors degree of darkness or lightness
Ultraviolet(UV) - ANSWERLight wavelength that's invisible to the human eye
Tone and Saturation - ANSWERTo color grade a light yellow or brown diamond,
graders compare it to a masterstone for
Heating - ANSWERThe annealing of irradiated diamonds to stabilize their colors is
done by
Depth of color - ANSWERThe combination of tone and saturation that determines
how noticeable a color is, is known as
A range of color - ANSWEREach letter grade in the GIA Color Scale represents