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26 Cards in this Set

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  • Back
bodycolor
basic color, determined by its selective absorption of light
chatoyancy
bands of light caused by reflection from parallel needle-like inclusions or hollow tubes
color center
defect in atomic structure, absorbing light & giving rise to color
color change
distinct change under different types of lighting
color range
selection of colors in which a gemstone occurs
color zoning
areas of different color, caused by variations in growth conditions
dispersion
separation of white light into spectral colors
extinction
dark areas in a faceted transparent colored stone
fine color
considered by trade to be most desirable
flourescence
emmision of visible light when stimulated by ultraviolet radiation
hue
1st impression of object's basic color
iridescence
rainbow effect by light broken up into spectral hues by thin layers
labradorescence
broad flash of color in labradorite feldspar, disappears when gem moved
milk & honey
two-toned effect seen when chatoyant gem is positioned at right angles to light source
orient
iridescence seen in some natural & cultured pears & mother-of-pearl
play-of-color
flashing rainbow colors in opal
pleochroism
different bodycolors from different directions
saturation
color's strength of intensity
selective absorption
material absorbs some components of visible light & returns others
tone
degree of darkness of lightness
trade terms
used in industry to describe particular gem colors or link gems w/specific geographic location
window
area of weak saturation in bodycolor, usually due to cut
adularescence
cloudy bluish white light in moonstone, caused by scattering of light
asterism
crossing of chatoyant bands, creating star in cabochon's dome
aventurescence
glittery effect caused by light reflecting from small flat inclusions
body color
basic color, determined by selective absorption of light