Next, discover the other elements of rating gems in Determining Gemstone Quality | A Guide to Judging Gemstones. Usually this is caused by improper cutting. These are areas of a transparent gemstone where the body color looks very dark to black.
#Define brilliance windows
Even the most carefully cut gemstone will show windows at certain angles, but windowing should be minimal, or completely absent when a stone is viewed from directly above.Īreas of the stone that look very dark are called extinction areas sections of the stone where light leaches out of the sides of the pavilion, rather than reflecting back to the viewer. A window is an area where light passes directly through a cut stone without reflecting back to the viewer. Any pale or weakly colored areas are considered windows in the stone. To evaluate brilliance in a cut gemstone, hold the stone level under overhead light and look directly down at the crown. More examples of brilliant gemstone cutting. These rays account for a gemstone’s brilliance. Only those light rays that reflect back out through the crown of the gemstone toward the eye of the viewer provide brightness and color. Light that reflects off of the pavilion facets, and then exits the stone through another part of the pavilion, will not return any brilliance to the viewer either. If light passes straight through the stone, it will not return any brilliance to the viewer. We can trace the noun brilliance back to a Latin root meaning 'to shine like a precious stone,' and now we use it do describe things that glow with light, shine with color, or sparkle with intelligence.
City dwellers might be surprised at the brilliance of the stars in the night sky the first time they go camping in the mountains. When light passing through the crown reaches the rear or pavilion facets of the gemstone, it can either travel out through the bottom of the gemstone or reflect back into the stone, depending upon the angle at which it strikes the facet.Įxamples of good and bad brilliant cutting results. Brilliance is a quality of being intensely bright or vivid. For example, an emerald will absorb most of the red, and some of the blue and yellow portions of the visible spectrum, leaving mostly green to be reflected back to the eye of the viewer. The spectral colors that are not absorbed determine the stone’s color. As it does so, some of the component colors of the visible spectrum are absorbed. White light entering a gemstone from above travels through the gem in a straight line. The brilliance of a gemstone is determined by the path light takes as it travels through the stone.
#Define brilliance series
This post is the 4th in a series all about our priorities, determining what our main things are and.
#Define brilliance how to
Brilliance is a consequence of cut, and it is an important characteristic because it determines the perceived liveliness and color of a gemstone.ĭiagram of the features of a brilliant cut gemstone. How to Define and Share Your Unique Brilliance. Brilliance describes the amount of light that a cut gemstone reflects back to the viewer from the interior of the stone.
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