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The traditional distinction does not necessarily reflect modern values, for example, ... The facets must be cut at the proper angles, which varies depending on the optical properties of the gem. If the angles are too steep or too shallow, the light will pass through and not be reflected back toward the viewer.
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www.answers.com/topic/gemstone-1
www.answers.com/topic/gemstone-1
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If light does not reflect off a gem surface it will refract into the gem material. Refraction is the bending of the path of a light wave as it passes across the boundary separating two media. Refraction is caused by the change in speed when a wave changes medium.
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www.asia-gems.com/gemology/light.php
www.asia-gems.com/gemology/light.php
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It is a fine gemstone, but is over-shadowed by its two cousins. The second variety is the "cat's eye", also known as cymophane. The effect is caused by microscopic needle-like inclusions that reflect light into a single sliver of light running along the center of the crystal thus making it look like a living cat's eye.
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members.tripod.com/~HX_Scheherazade/gem.html
members.tripod.com/~HX_Scheherazade/gem.html
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A Brief Review of Gemstone Optical Properties from a Lapidary's Perspective; 3; 2 Optical Properties; 2.1 Introduction; The optical properties are of great importance when cutting a transparent rough as the light give life to the gem. ... - For the light to reflect within the pavilion, no facets should be cut near...
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www.cigem.ca/pdf/sandrine.pdf
www.cigem.ca/pdf/sandrine.pdf
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When a gemstone is cut en cabochon, the miniscule amount of light that is able to enter, and exit through the stone is due primarily to its crystalline structure and optical properties, and has little to do with the gem-cutter's expertise.
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gemstone.smfforfree4.com/
gemstone.smfforfree4.com/
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Materials that are not completely transparent either absorb light or reflect it. In absorbing materials, such as dark colored cloth, the energy of the oscillating electrons does not go back to the light. The energy instead goes toward increasing the motion of the atoms, which causes the material to heat up.
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www.madsci.org/posts/archives/1999-08/934381368.Ph.r.ht...
www.madsci.org/posts/archives/1999-08/934381368.Ph.r.html
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The best surfaces for reflecting light are very smooth, such as a glass mirror or polished metal, although almost all surfaces will reflect light to some degree. ... The reflection of visible light is a property of the behavior of light that is fundamental in the function of all modern microscopes. Light is often reflected...
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micro.magnet.fsu.edu/primer/lightandcolor/reflectionint...
micro.magnet.fsu.edu/primer/lightandcolor/reflectionintro.html
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Glossary Of Terms is designed to explain both general jewelry and gemstone trade terms ... Bezel setting, a metal rim gently secures a gemstone in place by the girdle. The bezel setting guards the gem from damage, yet does not block light from creating brilliance.
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www.gemsuite.com/gemstones/gemstones_glossary.html
www.gemsuite.com/gemstones/gemstones_glossary.html
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The Greeks proclaimed this highly prized, light blue gem aquamarine, because it sparkles like the sea touched by the sun. Found in an array of pastel tones from very light to medium ... A facet is a smooth, flat surface cut into a gemstone or diamond to refract and reflect light. back to top; - -; Fancy Color Diamond ;
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www.gemologica.com/glossary.php
www.gemologica.com/glossary.php
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