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Related Flashcards
Related Topics
Cards In This Set
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Average Girdle Diameter
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The Result achieved by adding the smallest and largest girdle measurements of a round brilliant and dividing by two.
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Crown Angle
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The angle formed by the bezel facets and the girdle plane
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Disperation
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The seperation of white light into spectral colors
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Finish
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The quality of the polish and pecision of the cut of a fashioned gemstone
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Girdle outline
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Face-up shape of a polished gem
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Length-to-width ratio
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Comparison of the length to the width of marquise,emerald, pear-shaped, oval, and princess cuts
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Make
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The qualities of a faceted diamond's proportion and finish
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Pavilion angle
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The angle formed by the pavilion main facets and the girdle plane
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Pavilion bulge
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Larger-than-usual pavilion angles on the middle tier of facets, designed to add weight to a step-cut stone
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Polish
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The overall condition of the facet surfaces of a finished diamond
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Proportions
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The angles and relative measurements of a polished gem, and the relationship between them
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Refraction
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The change on speed and possible change in direcrion of light as it travels from one transparent meaterial to another
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Refraction index (RI)
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A measure of the change in the soeed and angle of light as it travels from one tranparent material to another
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Shoulder
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One of the two sides adjecent to the rounded end of a pear or oval shape
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Symmetry
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The precision and balanceof a finished gems cut
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