Gold Purity As the most malleable of all precious metals, L'or est un excellent choix lors de la fabrication de conceptions avec des détails très complexes. Plus, C'est résistant à la rouille, Tarnish et corrosion. L'or pur est trop doux pour l'usure quotidienne, Il est donc allié avec un mélange d'argent, cuivre et trace de zinc, to give it […]
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defect? Why are the cut shapes of the same gemstones different? What is the corresponding relationship between gem quality evaluation and price? and many more. This requires salespersons to answer well. Only in this way can they play a better role in publicity and promotion. Because many precious natural gems, such as diamonds, rubis, saphirs, […]
There is a certain relationship between the caliber (inner diameter) of a jade bracelet and the thickness of the diameter. C'est, when the jade bracelet is smaller, its diameter is also thinner; when the mouth of the jade bracelet is large, its diameter is correspondingly larger. Only in this way, a harmonious beauty will […]
(1) Méthode intuitive: la méthode d'observation directe à l'œil nu. C'est également la méthode d'identification la plus courante et la plus réelle.. L'inspection peut être effectuée sous les quatre aspects suivants: ①En termes de couleur, forme, taille, brillant, etc.. Si c'est une perle ou un lot de perles, pour de vraies perles, they are […]
Diamonds are noble and luxurious ornaments, and jewelry with natural diamonds is the crown of jewelry. Cependant, diamonds are scarce and expensive, especially the larger ones, and most people don’t dare to care about them. Par conséquent, the use of cheap gemstones, man-made gemstones and even glass to replace or pretend to be diamonds […]
(6) Artificial rutile: Rutile is an ordinary natural mineral, and its composition is titanium dioxide. Because its refractive index (2.61～2.90) is higher than diamond (2.42), it is polished into a gem. Bright and dazzling flashes and rainbow-like changes can appear afterwards, which is very beautiful. It is a pity that almost all natural rutile is […]
Regarding the magnification of a magnifying glass for jewelry, some people think that the bigger the better, in fact it is not, because in terms of lens production, it exceeds 10 times and can guarantee its optical quality and clear aperture (the clear aperture of the magnifying glass is 16-20mm) Appropriate) is very difficult; secondly, […]
Plus important encore: Put artificial red and sapphire on white paper or in the water in a white container to observe. The color bands or growth lines are mostly curved and curved, while the hexagonal growth lines of natural products are slightly curved. The ribbon is straight. En outre, the fluorescence of artificial rubies is stronger […]
Mais leur composition chimique et leurs propriétés physiques sont très différentes. Par exemple, émeraude a une dureté de 7.5-8, tandis que la fluorite a une dureté de 4; Les émeraudes ont une densité d'environ 2,7 g / cm3, tandis que la fluorite (3.18g) /cm3), tourmaline (3.05g / cm3) et émeraude (3.33g / cm3) avoir des densités plus élevées. Dans le test intérieur avec le tribromométhane, Seules les émeraudes flottaient, et […]
Natural emeralds can be divided into two types: (1) American type: includes emeralds produced in Colombia, Brazil and the United States. It is characterized by low refractive index, small specific gravity, ultraviolet (long wave) irradiation and fluorescence, and the color turns red when observed with Charles filter. (2) African type: emeralds produced in Zimbabwe, Sud […]