Term
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Definition
| The Result achieved by adding the smallest and largest girdle measurements of a round brilliant and dividing by two. |
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Term
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Definition
| The angle formed by the bezel facets and the girdle plane |
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Term
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Definition
| The seperation of white light into spectral colors |
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Term
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Definition
| the quality of the polish and pecision of the cut of a fashioned gemstone |
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Term
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Definition
| Face-up shape of a polished gem |
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Term
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Definition
| Comparison of the length to the width of marquise,emerald, pear-shaped, oval, and princess cuts |
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Definition
| the qualities of a faceted diamond's proportion and finish |
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Term
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Definition
| the angle formed by the pavilion main facets and the girdle plane |
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Term
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Definition
| Larger-than-usual pavilion angles on the middle tier of facets, designed to add weight to a step-cut stone |
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Term
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Definition
| The overall condition of the facet surfaces of a finished diamond |
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Term
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Definition
| the angles and relative measurements of a polished gem, and the relationship between them |
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Term
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Definition
| The change on speed and possible change in direcrion of light as it travels from one transparent meaterial to another |
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Term
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Definition
| 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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Term
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Definition
| One of the two sides adjecent to the rounded end of a pear or oval shape |
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Term
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Definition
| the precision and balanceof a finished gems cut |
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Term
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Definition
| Table size expressed as a percentage of a round billiants average girdle diameter |
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Term
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Definition
| Table-to-culet depth, expressed as a percentage of average girdle diameter |
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