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