Faceta (cristal)
Sign in to savethumb|A faceted amethyst Facets () are flat faces on geometric shapes. The organization of naturally occurring facets was key to early developments in crystallography, since they reflect the underlying symmetry of the crystal structure. Gemstones commonly have facets cut into them in order to improve their appearance by allowing them to reflect light. The earliest diamond cutting techniques were simply to polish the natural shape of rough diamonds, often octahedral crystals. It wasn't until the 14th century that faceting, the process of cutting and polishing a gemstone to create multiple flat
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As facetas são faces planas em formas geométricas. A organização das facetas que ocorrem naturalmente foi a chave para os primeiros desenvolvimentos na cristalografia, uma vez que refletem a simetria subjacente da estrutura do cristal. As gemas geralmente têm facetas cortadas para melhorar sua aparência, permitindo que reflitam a luz.
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