According to the information collected by the major jewelry inspection stations across the country, the emerging jewelry emerald has become the focus of recent tourism shopping fraud cases; some Asian countries or regions jewelry merchants sell synthetic emeralds, posing as natural emeralds, Sell ​​several times the high price of raw materials. Natural emerald gemstones are variegated in color, and the collection price is high; the price in the Guangzhou market is stable and there is a decline, and the 1 carat product is sold between 40,000 and 50,000 yuan. So, what about the views of ordinary citizens about emerging jewelry emeralds? The reporter then learned in Xi'an Parkson, Kaiyuan Mall and several major antique city franchise stores that most citizens still know very little about emeralds, although some people have consumption, but they do not intend to collect. Aunt Li, who lives in the south of the city, said: "I usually only collect jade, because people all over the world know that I bought emerald jewelry, pendants and rings, but the grades are average. It looks not as beautiful as the green emerald, so I only wear it. In this regard, Wang Shirong, a member of the Shaanxi Cultural and Art Judicial Appraisal Center, told reporters that the jadeite products below 200,000 yuan are basically not worth collecting, but if they are used to buy emeralds, they can Buy a high-quality, 2 to 5 carats boutique; emerald and diamonds, is the world's top five gemstones, long-term collection value is not worse than high-end jade. Moreover, compared with jade, the emerald's "price-performance ratio" is higher. If the green jade is able to reach the level of emerald color, the price is at least several hundred thousand yuan, and the price is 5-10 times that of emerald.
Wang Shirong reminded the public that the emerald collection is very different from the diamond. It is not about the "weight" of the hero. The color is the most important factor in determining the value of emerald. This is similar to jade. Second, the clarity factor is also important. The same 3 carats of emerald, dark and sturdy, the price is at least 30,000 yuan, and if it is brilliant, high saturation, good clarity, the price can reach more than 300,000 yuan, the price difference is 10 Times.
In the face of some unscrupulous businessmen mixing fake emeralds into the market, how do we identify its authenticity? Industry insider Wen Boren told reporters that the distinction between natural emerald and YGA and glass can be made according to the following two points: 1. Natural emeralds are mostly flawed and cracked. This is similar to ruby, and most of them are "cotton". Sometimes some black mineral inclusions and other impurities are visible; while the synthetics are mostly clean or have a small amount of air bubbles. 2. Emeralds are visible in dichroism. Viewed from different directions, the gemstones are emerald-blue-green or yellow-green, while both glass and YAG have only one color.
Most of the differences between natural emeralds and synthetic emeralds need to be carried out in the laboratory. The general differences are: 1. The proportion of natural emeralds is larger, generally greater than 2.7, while the emeralds synthesized by fusion are only specific. 2.65~2.66 or so. However, it should be noted that the hydrothermally synthesized emerald also has a higher proportion. 2. Natural emeralds are slower to react under ultraviolet light, or dark red, while synthetic emeralds tend to produce strong red fluorescence. This test should generally be compared to the standard.
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Expert pulse
There are cotton wool, cracked products, more value
Because of its precious and rare, emeralds and diamonds, rubies and sapphires are called the world's four precious precious stones. There are many counterfeit items, almost all the green varieties of gems, not even the gems of green stones, are used to impersonate. The most common counterfeits are green emerald jewelry zircon, green olivine, green garnet, green glass and synthetic emerald. There are three ways to distinguish: 1. Use Chelsea filter to observe, red is emerald, green is other natural gem; 2. emerald has low refractive index, no refraction, and like gemstone like green diamond With a dazzling metallic luster; 3. Magnifying glass to observe the interior, natural emeralds generally have solid, liquid, gas mixed together, and artificially mostly gas or gas-liquid mixed inclusions, often smoke clouds Or feathery. The proportion and refractive index of artificial emeralds are generally low.
In the current mainland market, emerald fraud technology is not very sophisticated, with more synthetic and imitation products. The interior of the natural emerald must contain a cotton-like body resembling the interior of a natural jadeite. The cotton wool exhibits irregular changes, and many small cracks appear under the sunlight. Crystals without batt and fine cracks are mostly synthetic emeralds. Specifically, there are three aspects:
1. Artificial glass. Green artificial glass is most similar to emerald, and it can achieve chaos in terms of color and appearance. Air bubbles in the man-made glass or some other residual material can create an appearance similar to a crack or fingerprint-like inclusion, but the man-made glass lacks the green fluffy feel of emerald. People who are more familiar with emeralds will have doubts about the glass at the first observation of the sample, but some yellow-green or blue-green emeralds have a lighter green luster and are not easy to understand. Different from artificial glass, special care should be taken when identifying.
2. Artificial garnet aluminum garnet. Artificial garnet garnet is also very similar to emerald, because artificial garnet is also a homogeneous body, and the difference is similar to the artificial glass step. Only the artificial yttrium aluminum garnet has a large refractive index, generally greater than 1.81, which is generally not measured by the refractometer, and the emerald can be directly measured at 1.575~1.583. The interior of the artificial garnet is generally clean and occasionally air bubbles.
3. Flatten the gemstone emerald. There are many forms of jewels, and there are two or three layers. The most common are emeralds and beryl, emerald or beryl plus green man-made glass, red garnet and green man-made glass, colorless crystals plus a layer of green material plus colorless crystals. The top is usually emerald or beryl, and is lined with various green materials such as man-made glass, synthetic emerald, light-colored beryl, etc., which can be glued with colorless or green glue.
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