1. Aquamarine
Many natural blue-greens have a slight green-yellow tinge to their color without any treatment, and very few are pure blue.
After heating, the yellow-green tint of the gemstone is removed and the body color of the gemstone is a deeper blue.
2. Tourmaline
Dark tourmaline often goes unnoticed in the market, which makes people feel old-fashioned. Heat treatment with tourmaline is different from other gemstones. Its heat treatment is to lighten its own color, make dull tourmaline beautiful and transparent and enhance the transparency and clarity of tourmaline.
Tourmalines that are blue (neon blue or purple), turquoise-green-blue or green and contain elements of copper and manganese can be called "Paraiba" tourmalines, regardless of their origin.
As the "Hermes" of the tourmaline world, Paraiba doesn't really have all the dream colors we've seen. There are many neon blue Paraiba on the market which are made of purple Paraiba after heat treatment.
3. Zircon
Zircon is not synthetic cubic zirconia, natural zircon, also known as hyacinth stone, is the birthplace of December. For natural zircon, heat treatment can change not only the color of the zircon but also the type of zircon. After heat treatment, colorless, blue, yellow or orange zircons can be obtained, and zircons of different origins will form different colors after heat treatment.
Heat treatment under reduction conditions produces blue or colorless zircon. The most prominent of these is the reddish brown zircon raw material in Vietnam, which is colorless, blue and golden yellow after heat treatment, which is the most common variety in gemstone jewelry. Heat treatment under oxidizing conditions produces a colorless golden yellow zirconium when the temperature reaches 900 ° C and some samples may be red.
However, it is worth noting that some heat-treated zircons will partially or completely regain their original color when exposed to strong sunlight or over time.
4. Crystal
Heat treatment with crystals is mainly used for some amethysts with little color and the heating amethyst can turn it into a yellow or green crystalline transition product. The processing consists in putting the amethyst in a heating device with controlled atmosphere and temperature and then selecting different temperatures and atmospheric conditions to heat the crystal so that the color, transparency, transparency and other aesthetic characteristics of the glass are significantly improved.
Yellow is relatively rare and the price is relatively high. Most of the yolk on the market is formed from amethyst after heat treatment. At a high temperature of 450-550 ℃, the color of the amethyst turns yellow.
Everyone loves beauty and people love gems for their beauty. However, there are few gemstones with natural beauty, the optimization method is to allow these gemstones with insufficient appearance to show their beauty.
Since the birth of precious stones, research on the optimization of natural precious stones has never stopped. The heat treated gem has only undergone a slight modification, while satisfying the coexistence of quality and economy, and is still a natural gem. When buying, you should look for the certificate issued by the gemstone testing authority, which is also the only basis for judging the gemstone quality.
Post time: May-06-2022