Exam (elaborations)
gia colored stone essentials.
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- ARRT CI Exam Study Guide
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- ARRT CI Exam Study Guide
gia colored stone essentials.
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gia colored stone essentialsadularescence - ANS-the cloudy bluish white light in a moonstone, caused by scattering
of light
amorphous - ANS-lacking a regular crystal structure
asterism - ANS-Crossing of chatoyant bands, creating a star in the dome of a cabochon.
Aventurescence - ANS-A glittery effect caused by light reflecting from small, flat
inclusions within a gemstone.
bodycolor - ANS-A gemstone's basic color, determined by its selective absorption of
light.
Chatoyancy - ANS-Bands of light in certain gems, caused by reflection of light from
many parallel, needle-like inclusions or hollow tubes.
chemical composition - ANS-kinds and relative quantities of atoms that make up a
material
chemical formula - ANS-written description of a material's chemical make up
color center - ANS-A small defect in the atomic structure of a material that can absorb
light and give rise to a color
color change - ANS-A distinct change in gem color under different types of lighting.
color range - ANS-The selection of colors in which a gemstone occurs.
Color zoning - ANS-Areas of different color in a gem, caused by variations in growth
conditions.
colored stone - ANS-any gem material other than diamond
Corundum chemical formula - ANS-Al2O3; there are 3 oxygen atoms for every 2
aluminum atoms
crystal structure - ANS-Regular, repeating internal arrangement of atoms in a material.
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