Description
The precious stones, mineraux rare souvenirs from the ornaments and the objects of decoration, the son of the beauté, are reflected in the aspects of the visual aspects of the color, the brilliance, the light, the transparency and the effects of the light. La durabilité, déterminée par la dureté, la fragility/fissibility et la resistance chimique, is également essential. La rarete d'une pierre précieuse affecte sa frequency d'apparition dans la nature. There are different waistlines, don't have cabochons, a waistline and facet shapes, but the surface of the pierre is separated from its facets. The composition, the characteristics of the colors, the division of the colors, the inclusions, the effects of the special light, the dispersion and the surfaces of the fracture and the resulting sont prizes. The quality of the work is done in the manufacture of necklaces, boucles d'oreilles, bracelets and jewelry, but also in the production of industrial applications. Des exemples bien connus sont le diamond, le rubis, l'émeraude, le saphir, l'aigue-marine, la topaze, la tourmaline, l'améthyste, la citrine, la cornaline, l'opale, l'onyx, la turquoise, le lapis-lazuli et le grenat. In the XVIIIth and in the debut of the XIXth century, the production process of the jewellery, based on the name of the initials of a person, guides the premiere of the name of the pierre précieuse, according to the alphabet of the pierres précieuses. In the 19th century, the beautiful acrostic with its appearance, exprimant des sentiments avec des pierres précieuses. The example of the additional meaning of the bague anglaise "regard", a bague with fiançailles dans laquelle le mot "regard" according to the shape of the noms anglais of the pierres précieuses rubis, émeraude, grenat, améthyste and diamond.
