How to identify the authenticity of jadeite, learn three tricks to avoid being fooled

How to distinguish real and fake jadeite? Learn the truth from the counterfeiting methods

1. Color fraud:

A Dyeing and coloration, adding organic dyes into the interior of jade by heating is called dyeing. To start coloring, heat jadeite with good water quality to 212°C and then soak it in chromium salt solution for 2 hours. The chromium salt will penetrate into the jadeite lattice, making it appear beautiful green. B. Coated jade, with organic green dye applied to the surface of jade jewelry. It also means "put on clothes". c. Brightening without polishing. Jade jewelry is not polished, but sprayed with a layer of green or colorless brightening paint.

2. Fake raw materials:

A. Second layer of stone: the main stone is low-grade jadeite raw material, and a layer of jadeite flakes with the best water content is glued on the incision. B. Three-layer stone: the main stone is low-grade brick material, with a thin piece of green glass glued in the middle, and a thin piece of colorless jadeite with good water content glued on it. C. Artificial skin is made when green cannot be found or the bottom is bad, or when gambling on stones is lost and the jade is glued on again. The same mud, sand and glue as the skin is mixed on the surface of the jade raw material. D. Artificially drill holes in jadeite, make holes near the surface of jadeite, put green substances into the holes, and then seal the holes so that people can see the green inside from the surface. E. Burning jadeite. After the new jade is burned by fire, it becomes unclear and can be regarded as old jade. F. The cutting marks made by humans look like a washing board, which prevents light from entering and makes it difficult to observe. This is mainly due to the dirty bottom, poor water and many cracks.

3. Use other green jade and artificial green ornaments to pretend to be full of green.

B-grade jade (known as "new jade" in the market) refers to jade raw materials or finished products that are soaked in chemical raw materials such as strong acids (including "aqua regia" prepared with concentrated hydrochloric acid, concentrated nitric acid, etc.) in order to dissolve the impurities between jade grains. It makes the jadeite, which originally had many impurities, cracks, lack of transparency and was not beautiful, appear cleaner, more transparent and more diffuse in green. And you can add color as you like.

The internal structure of jadeite that has been soaked in strong acid is destroyed and becomes very fragile, so it needs to be injected with epoxy resin. The national name is: Jade processing, after drying, it is colorless and transparent, and beautiful.

However, epoxy resin is an organic compound. It will age over time, gradually turn yellow, and develop many cracks. The bright and beautiful colors gradually fade away, and the permanence of natural gemstones no longer exists. Therefore, there are three shortcomings of B-grade jadeite: one is that it is fragile and easy to break. If you touch them lightly against each other, the sound is short and there is no crisp sound. Second, it will age and fade (usually within three to five years), making it worthless after aging; third, the optimization process uses chemical corrosives such as "aqua regia", which is harmful rather than beneficial when worn.

At present, water glass or silicone has appeared on the market instead of epoxy resin as reinforcing filling materials, making it more difficult to identify, but it damages the essence of jade and cannot be repaired.

A, B and C grade jadeite

Jade is mainly an aggregate composed of jadeite minerals or other sodium pyroxenes with high jadeite molecules, and is also accompanied by small amounts of other pyroxenes, amphibole, albite and other minerals. Jadeite is the commercial name for gem-grade jadeite. It is the most precious and valuable type of jade and is known as the "King of Jade". The State Bureau of Technical Supervision has issued three types of technical standards based on the jade jewelry currently sold on the market, namely A, B, and C grades.

This standard does not represent the grade of jadeite. The following is a brief introduction to A, B, and C jadeite:

Grade A: Products made from natural jade raw materials. Its texture and color have not been artificially modified and remain natural. This type of jewelry will become more moist and shiny as you wear it for a longer time. High-grade jadeite has both value preservation and investment value. It is not necessary to add the words "natural or A-grade" when selling the product. If the mark is "Jade Bracelet", it must be natural or A-grade.

B-grade jadeite: Jadeite raw materials or semi-finished products with dirty, gray-black, dry, green or dark colors are processed by artificial chemical and physical methods to increase their transparency, improve their appearance, make them translucent and bright, and make the original color more beautiful. This kind of artificial strong corrosion treatment destroys the original structure of jade, making it loose, so it needs to be filled with organic glue to bond it. This will reduce the quality and change the original optical and physical properties of jade. It has lost its true value.

C-grade jade: Based on the processing of B, the colorless or light-colored jade is artificially dyed into bright and beautiful colors. The added colors are red or green. For BC goods, the national standard has clear regulations that the name of the goods sold must be marked with "Jade Optimization (Processing)", otherwise it is a fraudulent act of passing inferior goods off as genuine ones. There are many countries in the world that produce jadeite, such as Russia, Japan, the United States, etc.

However, the only place where jade is currently produced is in northern Myanmar, adjacent to the western part of my country's Yunnan Province. The value of high-end jade is no less than that of high-end gemstones. Then the main aspects of evaluating its logo are as follows.

Color: specifically refers to green. Nongyangzhenghe is the best quality; the rest are second best.

Kind: The good kind is the one with fine, dense, uniform and translucent texture; the inferior kind is the one with rough texture, loose structure and particles visible to the naked eye.

Water: High transparency and bright water indicate good water head. Generally speaking, good planting will result in good water head. Poor transparency and opacity indicate dry water head.

Flaw: The best quality product is the one without cracks or flaws. The ones with black, dirty and cracked willow are inferior. There are very few perfect jades produced in nature.

Craftsmanship: exquisite design, fine workmanship, and careful polishing. The opposite is second.