Crystal evaluation standards are different from high-end gems. Most high-end gemstones put color in the first place of evaluation, while for crystal, color and clarity (called crystal in the crystal industry) are almost equally important factors.
1, color: For any gem, color is very important, crystal is no exception. If the crystal crystal is colored, such as powder crystal, citrine, amethyst, etc., the highest standard of color evaluation is bright and moving, without gray, black, brown and other colors. Such as pink crystal, the color is better with pink; amethyst, the color is required to be fresh purple, pure and not black; citrine, the color is not green, lemon color, preferably gold orange. For hair crystals, the color of the crystal is also important. The same hair of the blonde crystal, the crystal is completely colorless (white crystal) and the crystal is slightly brown, the visual perception of the naked eye is also different, so the price of the former will be higher than the latter.
2, clarity: crystal and gemstone clarity requirements are very different. Gemstones are rare and rare, so it is generally not too demanding for the purity of gemstones. The output of crystal is really amazing, so people usually ask for the higher the clarity of the crystal, and try to avoid crystals with more obvious inclusions.
3, impurities: If there are legendary characters in the crystal internal impurities, such as Buddha, constellation, zodiac and other values ​​may be higher than the same color and clarity of the crystal.
Dark orange citrine is considered to be more valuable because it is rich and mellow, giving a royal sense of honor. In ancient China, the emperor's clothing was this color, and the civilians absolutely forbid the use of this royal exclusive color. But the bright and bright eyes of the lemon color with a little greenish tone are also very popular. If the citrine is not high in clarity, or the color is gray or tea, the price will decrease.
The main origin of citrine is in Brazil, and the quality is also high. However, many citrines in the domestic market are made by heating and discoloring amethyst. The color is lighter and there is no glamorous feeling, and the color tone is a bit thin. Although they are all quartz, it is generally believed that the value of such citrine is not as high as that of natural citrine.
For citrines that are very light in color, some jewelers also use irradiance to enhance the color of the gems and make the gems look more beautiful. The citrine of this type is more numerous and cheaper, and its color is always unchanged at normal room temperature, so it is generally accepted by the public.
Look at the selection of materials: well-selected crystal products, should not see the star-shaped, cloud-like and floc distribution of gas-liquid inclusions. The texture is pure, smooth and crystal-clear. If it is found that there are cracks and spots with different depths, it is a defective product.
Look at the workmanship: The processing of crystal products is divided into two types, namely the grinder and the engraver. Such as crystal necklaces, bracelets, earrings, etc. are abrasive products; Guanyin image, inner painting snuff bottle, etc. are engravings. A well-made crystal product should be refined, not only can fully reveal the external beauty (styling, style, symmetry, etc.) of the crystal product, but also can dig its inner beauty (crystal, clever color) to a large extent.
Look at polishing: the quality of polishing directly affects the value of crystal products. The crystal must be honed by diamond sand during the processing, and the rough production will cause traces of friction on the crystal surface. Good crystal products have better natural transparency and luster, and they are said to be "fire heads".
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