Many colored gemstones have been manually processed, which is determined by the characteristics of the color treasure and should not be negated. For example, many gemstone varieties use irradiation to improve color. The color of some irradiated gemstones is stable under normal conditions, such as blue topaz, pink tourmaline, smoky quartz, golden beryl, etc., but there are some irradiated gemstones in the case of heat or exposure. Will fade.
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For example, most of the natural tourmaline has cracks of different degrees. Generally, the tourmaline necklaces and bracelets sold on the market basically have cracks. This is the structural feature of the tourmaline, but it affects the beauty and durability of the tourmaline jewelry. Tourmaline is easy to crack and break during processing. In order to improve the yield and improve the aesthetics and durability of tourmaline jewelry, the filler in the tourmaline material is filled and consolidated with the filler such as glass glue before processing. Avoid breaking raw materials. If it is higher, it will affect the value.
These ordinary buyers are difficult to distinguish, so be sure to look for the certification certificate of the authority when purchasing.
Many people who travel abroad will buy locally produced gems, and foreign certificates will be issued for natural and optimized gems. However, there are many professional terms in the English Jewelry Certificate. The average consumer can't understand it. For example, "Synthetic Emerald", Chinese translation is "synthetic emerald". If you don't pay attention, you can buy it back. stand by.
At present, there are many methods for optimizing the treatment of red and sapphire. There are traditional heat treatment, dyeing treatment, oiling treatment, etc. The newly developed treatment methods include glass filling, heat treatment with filling, surface dispersion treatment and irradiation treatment. Emeralds are widely used in oil leaching to allow oil to penetrate into the cracks to partially cover the cracks. These treatments will be explained in the formal identification certificate. You must read the relevant instructions carefully before purchasing. In particular, the “Remarks†section of the English version of the certificate should fully understand its meaning.
Heat treatment is a very important method to optimize the color of gemstones. For example, treating corundum gemstones in a certain temperature and ambient atmosphere can make the color more vivid; deepen the color of light-colored gemstones; eliminate internal inclusions. At the same time, since the heat treatment does not change the molecular structure of the red sapphire itself, it has now become a general optimization method for a gemstone. According to experts from the IGI International Gemological Institute Shanghai Information Center, about 90% of the rubies on the market are heat treated. The price of red sapphire that has been heat treated will vary by several times.
How to treat heat treatment is a matter of opinion. Natural red sapphires are not much commercially good, and the mines are almost exhausted. If not heat treated, the number on the market will shrink sharply. After the heat treatment of the natural red sapphire, the commercial grade can be upgraded, and the quality that has already been good can be improved to a higher level. Therefore, the heat treatment work not only increases the quantity and quality of the red sapphire market, but also promotes the purchasing power of consumers and increases the market activity.
It should be said that the industry-recognized heat-treated red sapphire is still a natural gemstone. However, gemstones treated by other methods, such as sputum diffusion, dyeing, etc., are not of the natural gemstone grade, and the value is relatively low.
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