? Gems can be divided into natural gems and artificial gem. When we choose precious stones and jewelry, how can we identify them with the naked eye? Natural gemstones are generally soft and natural in color, and sometimes the colors are very mixed. Several kinds of * * * in a gem, the pattern is irregular, but very delicate. Observing the gem with naked eyes under strong light, or carefully observing it with a magnifying glass for more than 5 times, sometimes you can see cotton wool, reticular or tree-root inclusions and small cracks in the gem, and occasionally you can see obvious flat growth lines.

Some gems feel cold and slippery, and look wet, as if they had been soaked in oil. A good gem has the effect of "cat's eye" and "starlight" after polishing, that is, there is a white line in the gem, just like the white line in the cat's eye under strong light during the day; "Starlight" is a gem that rotates in the sun, and the reflected light shines like the blink of an eye of the stars at night. Artificial gem is generally bright, uniform and pure. After polishing, the luster is dazzling and the color consciousness is strong. Because some rare earth elements are added, there are monochromatic ones, such as black, red and yellow. There are also composite colors, such as rose red and sauce purple. But there will never be a phenomenon that several colors of natural gems are in the gem.

? In addition, some gems have obvious circular bubbles and traces of synthetic growth products; Obviously, the growth line is linear; Larger particles; There are many specifications of the same color; Harder ones, generally above Mohs level 6, can't be carved with a knife. Instead, these stones can mark glass. Identification of true and false gems

In the sun, with a light silver pot or white satin as the lining, put the gem at a height of about five inches from the lining to make it exposed to the sun. If the light passing through the gem shows the appearance of the silver wing of Venus in the lining, it can be concluded that it is genuine. If it is a fake gem, a shadow will appear on the lining. If you put the gem in your mouth for a while, you will drool, not only will you not feel dry, but your mouth will be very cold. If the gem itself gets hot, you can conclude that it is genuine. Emerald Jian Zhen method

Fill a bowl with clear water, and put the gem into the bowl, which can make the whole bowl appear pale green and is a real emerald; Or put Jian Zhen's gems in a copper basin, enclose them with paper, and light the white paper with fire. If fire can turn green, it is true jade; Or prepare a pot of burning coal, and put Jian Zhen's gems into the burning coal. When the charcoal smells, the emeralds will go out immediately.