Experts teach you to identify jade

Gold rose, and the diamond rose. The reporter went to the Jade Zone on the second floor of the West International Jewellery City to see if the price of jade is also rising. The sale of jade counters** told reporters that several different grades of jade bracelets, prices have doubled over the same period last year, especially in recent months. The best selling price is concentrated between 1 and 20,000 yuan.

However, in jade jewelry, jade replicas may be the most, how to identify true and false? The reporter specially asked Liang Mingwei, an inspector of the National Jewellery Quality Supervision and Inspection Center of the Western International Jewelry City, to answer your questions.

Q: How many kinds of imitation jadeite products are on the market? What is the difference between them and Jade?

A: As long as you purchase jadeite in Shenzhen West International Jewelry City, you can enjoy professional and scientific identification for free. In addition, the National Jewellery Quality Supervision and Inspection Center regularly conducts free testing of large-scale public welfare activities. According to our statistics, the jewellery category most requested by experts is jadeite. Incidentally, consumers are reminded to buy regular, well-known jewellery stores or larger, reputable shopping malls when buying jadeite jades with higher prices. Also remember to ask the merchant to write a related jewelery certificate.

To identify the true and false jade, we must first know the difference between jade and similar jade.

1. The difference between jadeite and jadeite. Nephrite is a special group of amphibole minerals. Nephrite has a relatively uniform color, with white, dark green, dark green, etc., but no bright green. It is oily, no green. The refractive index is also slightly lower than that of jadeite.

2. The difference between Dushan Jade and Jade. Henan Dushan jade is also called “Nanyang jade”. The green Dushan jade is not bright enough. On the same jade piece, there may be white, green, black-green and yellow-brown colors coexist. Most Dushan jade jade have poor transparency, poor toughness and brittleness. Emerald Dushan jade jade looks like jade, if careful, green jade Dushan jade has a granular structure or dissolution and replacement structure, often with black spots. The red color under the color filter is the distinctive feature of the identification of the emerald green Dushan jade and jadeite.

3. The difference between leeches and jade. In the jewellery markets of Yunnan, Kunming, Ruili, Tengchong and Other major cities in the Mainland, there is a kind of “ice seed” jade with a very good water head that is transparent or translucent. The color is generally white or gray and has less White spots and ribbons are unevenly distributed. This type of jade is known locally as "water scorpions" in Yunnan. This kind of jade is often processed into bracelets, pendants and carvings. Observe with a magnifying glass that the water pods are not visible and have more white nacre or cotton. Hand rubbing it, there is a clear sense of lightness compared with jade.

4. The difference between Australian jade and jade. Australian jade (green chalcedony), also known as Nanyang jade. Because of its green color, people love it. It has a certain degree of transparency. Fine particles, low prices. The green chalcedony has a bright and uniform color, with apple green, blue-green and other colors. The polished surface has no orange peel effect and looks like plastic. Observe with a magnifying glass, do not see Tsui sex.

5. The difference between Dongling jade and jadeite. The Dongling Jade is also called Indian Jade. Using perspective light, it can be seen that there are parallelly arranged green mica mica flakes in the Dongling Jade. Sideways often form a "green line." Under the Charles filter, the green chrome mica appeared red. Tangling jade is much smaller than jade, and it can be weighed out by hand.

6. The difference between Malay jade and jade. Malay jade is a dyed quartz polycrystalline jade. Strictly speaking, the name “Malaysia Jade” is not allowed to appear in any trademark or appraisal report. Observed with the naked eye, the color of Malay jade is too bright, but it is very unnatural. Under the 10x magnifying glass, the color distribution characteristics of the loofah sac can be seen and the color is very floating.

Q: What are the manual processing methods for jadeite?

Answer: There are three kinds of artificial methods for jadeite: coloring, dyeing, and de-yellowing. Local color, ie heat treatment. The yellow, brown or brown jadeite is slowly heated in a common oven and becomes cool and cool when it becomes porcine liver color, which means it becomes red jade. Dyeing, soaking with coloring agent, turning it into green or purple jade. De-yellow into the plastic, the jade soaked in strong acid (such as **), so that yellow off, with alkali and then pressurized plastic injection, after cooling and scraping off the surface of plastic. There is a kind of callous emerald, which is different from natural emerald. Need to identify the emerald can be placed in the ** or **, a few hours later green back. Put the Fei color jade on the ironware of 70-80°C, and the green color will fade out after a few hours. These various methods of artificial treatment are doomed to the superiority and inferiority level of jadeite, so there are jade A, B, C goods.

Q: How to identify the pros and cons of jadeite?

A: The definition of Jadeite A, B and C has reached a consensus: Natural Jade pieces without filling and coloring treatment are called A goods. For example, after filling and processing, said B cargo; B cargo mineral composition is natural jade, the color is natural, but the aging of filled plastic will affect the color of the bright and bright, affect the transparency, gloss and so on. For example, if the C product is processed by additive color processing, such as the simultaneous filling and coloring treatment of B+C products. The testing center has a variety of professional instruments. For example, the A product is within the range of 2800 to 3000 in the infrared spectrum, and its curve rises smoothly. The B cargo Jadeite fluctuates and fluctuates frequently in the same value range. In addition to the identification of these professional instruments, buyers can simply identify the merits of jade from color, texture, polished surface, and sound.