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, South Africa, Zambia, Tanzania, 인도, Pakistan and other places in Asia are characterized by high refractive index, high specificity, and generally do not emit light under ultraviolet light. The color filter observation is still green or Gray green. 그러므로, the statement in some books and magazines that “observed from the Charles filter, if the gem is green, it must not be emeralds, because the emeralds seen in the mirror should be red.” , So it is one-sided.
게다가, the low-grade emerald egg-shaped light body ring noodles sold in the domestic jewelry market or trade fairs are processed from emeralds produced in a certain place in Yunnan, my country. 일반적으로, they have poor transparency and most of them have microcracks (in order to cover up defects, Commonly used cedar oil or synthetic liquid epoxy resin impregnation). But its low price can meet the requirements of some low-end consumers.
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시작합시다 : mo@kingjy.com
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