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Definition
| the highest degree of luster possible in a transparent material |
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Definition
| the angle at which a ray of light strikes a surface, measured from the normal |
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Definition
| the angle between the normal and a reflected ray of light |
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Definition
| the effect of all the diamond's internal and external reflections of white light |
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Definition
| angle between the normal and the maximum angle of refraction, which is the largest angle at which rays inside the diamond can escape |
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Definition
| an optical property that's the difference between the RI values of specific violet and red wavelengths of visible light for a given material |
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Term
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Definition
| the flashes of color you see in a polished diamond |
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Term
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Definition
| the appearance of a material's surface in reflected light |
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Term
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Definition
| an imaginary line perpendicular to the point where a ray of light strikes the surface |
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Term
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Definition
| the relative size, arrangement, and contrast of bright and dark areas that result from a diamond's internal and external reflections |
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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 relationships between them |
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Term
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Definition
| the bouncing back of light when it strikes a surface |
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Term
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Definition
| change in speed and possible change in direction of light as it travels from one material to another |
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Term
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Definition
| a measure of the change in the speed and angle of light as it passes from one material to another |
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Term
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Definition
| the flashes of light and the contrasting dark areas you see when the diamond, the light, or the observer moves |
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Term
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Definition
| the spots of light that flash as the diamond, the observer, or the light source moves |
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Term
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Definition
| the exactness of a finished gem's shape and the placement of its facets |
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Term
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Definition
| the passage of light into or through a material |
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Term
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Definition
| the distance between two adjacent high points of an energy wave |
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