This MM, you ask this question very well. Let me help you answer it, because I have encountered the same problem before, so I made a special trip to Colombia:

First of all, because emeralds are born with tiny cracks inside the surface, jewelers will optimize the cleanliness of cutting emeralds. The principle is to use transparent materials with similar refractive index to emerald to fill the tiny cracks inside, which will greatly improve the appearance and luster of emerald. Hundreds of years ago, Colombia used natural turpentine cedar oil for this optimization treatment, and gradually became the industry standard for emerald clarity optimization treatment.

However, with the passage of time, jewelers found that the optimization of oil purity had shortcomings, because turpentine would volatilize with time and its refractive index was not exactly the same as that of emerald. Since 1980s, new materials with optimized purity have appeared in the market, such as Canadian resin, araldite, Brazilian artificial resin opticon and so on. By the end of 1990s, newer materials, such as polymers, with better refractive index and non-volatilization, appeared. Because these materials are transparent, their refractive index is close to that of emeralds, and their principle is the same as turpentine, but the purity of emeralds is optimized without changing the natural color of emeralds, so they are recognized in the international trading market. It can be said that 99% of emeralds have been treated with optimized purity, and the materials used in the treatment also include the above.

This is the problem. Because our national inspection is unprofessional, they can't inspect the hard polymers PERMASAFE and GEMATRAT produced in the late 1990s. They think it is a foreign artificial substance, so they mark you as' therapeutic filling' on the certificate. In fact, this is ridiculous. The purification optimization of turpentine is also treatment and filling, and the principle is the same. Fine cracks are all oil-filled, why not indicate them on the national inspection? If you get it to a foreign laboratory, people are very experienced and rigorous. First, check whether jadeite is natural. As for the optimization of cleanliness, it is basically allowed, and you will not be labeled as a very amateur term' treatment filling'. Foreign laboratories mainly look at whether your stone is natural, and then look at the degree of purity optimization, because the degree has a great influence on the price of jade. Emerald has less natural fine cracks and less oil absorption, so the treatment degree is low and the price is high. In other words, the national inspection center has no ability to detect materials with optimized cleanliness, but foreign laboratories are different, so the problem you encounter is MM. Of course, there are still many people in the international market who are fascinated by the traditional turpentine-treated emeralds, but the proportion of turpentine-treated emeralds in the market is not high, and the price will be slightly higher. As for the hard polymers PERMASAFE and GEMATRAT, because different buyers have different reactions and acceptance, they are all optimized for the laboratory, so they all pass the test. All major laboratories in the world can detect materials used to optimize cleanliness. In fact, the best laboratory is CDTEC, Colombia's national testing center, which tests thousands of stones every day. What have you never met? However, what is marketing still depends on the Swiss certificate.

Differences of jadeite certificates at home and abroad;

In fact, the detection methods of emerald at home and abroad are basically similar, but the scale is slightly different. It's just that the expression is not clear to us. Please see the table below.

Parentheses for domestic certificates and international certificates are remarks.

Oil-free Emerald Oil-free Care-

The colorless oil emerald is filled to improve transparency, and the colorless material is used to improve transparency.

Emerald is filled with wax such as colorless resin and new materials to improve transparency, and colorless materials improve transparency.

Emerald dyed Qin colored substances improve the transparency and color.

In China, emeralds, whether colorless or not, are collectively called emeralds. In foreign countries, the oil that has not been soaked will be marked separately. In China, colorless oil is called jadeite, and other colorless substances are called fillers. In foreign countries, all colorless substances are written like this: Emerald is filled to improve transparency, and colorless substances are impregnated. This is the difference between certificates. At the market price, the use grade emeralds are basically filled with colorless materials, some are impregnated with oil, some are filled with resin or wax, and there are new synthetic materials. As long as the color of jadeite does not change, there is basically no difference in price. The price of emerald is more reflected in the aspects of volume, color and cleanliness, and has little to do with the filling materials. In the future, in order to assure everyone to buy our jadeite, we will provide two kinds of certificates at home and abroad, among which the authoritative certificate of Little Huang Zhuang Jewelry Appraisal Center is used at home.