![]() ![]() ![]() Thus it is totally reflected to the other side of the pavilion. In a well-made diamond, a high percentage of light entering through the crown starts out striking the pavilion outside the critical angle. Light striking a surface "inside the critical angle", will be refracted out of a diamond. Light traveling through a diamond is reflected if it strikes a surface "outside the critical angle". In diamonds, the maximum angle of refraction is 24.5 degrees, called "the critical angle". Note: The refractive index of diamond is 2.41, the highest of any natural transparent gem. The degree to which it bends is called "the refractive index". When light enters a diamond, it actually bends or refracts. A well cut diamond internally reflects light from one facet to another, disperse and reflect it through the top of the stone maximizing the brilliance as well as the fire of the stone. Ideally the diamond cut is done in a way to best reflect the light that shines into it. There are many shapes that diamonds are cut like round, oval, pear, heart, marquise, emerald or princess. To better understand a "very good" & "excellent" diamond cuts, it helps to understand how light reacts within a diamond. Though color, clarity, and carat also contribute to a diamond's appeal, it's the cut that determines the symmetry of the stone facets, overall proportions and ability to reflect light. Understanding The Behavior Of Light In Diamonds Other factors like: - crown angle, girdle thickness, pavilion depth-percentage (the ratio of depth to girdle diameter), culet size, polish and symmetry - also play a major role in judging a diamond's overall cut quality as these factors highly effect "the behavior of light" in diamonds. Determined as a percentage of the overall diameter of the stone.Įxperts express differing opinions on the best "table size" (the diameter of the largest facet on the top of the stone), and the best "Depth" for a diamond, because these factors alone are not sufficient to accurately judge its cut. Girdle: The narrow rim around the widest part of a diamond, separating the crown from the pavilion.ĭepth: The height of a gemstone, from the culet to the table. Pavilion: The lower portion of a diamond, from the girdle to the culet.Ĭulet: The facet or point at the bottom of the diamond's pavilion. ![]() Crown: The top portion of the diamond, from the girdle to the table. ![]()
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