As pedras preciosas, também conhecidas como gemas, são minerais, rochas ou matérias petrificadas com brilho e coloração especiais encontradas na natureza. A maioria dessas pedras é formada no interior da terra, podendo ser também criadas sinteticamente, em laboratório. Para classificar e caracterizar o valor de uma pedra é considerado quatro critérios: cor, pureza, quilate e…
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