Jewelry has a broad sense and a narrow sense. Jewelry in a narrow sense refers to jade products. Jewelry in a broad sense should include jewelry, handicrafts or other treasures made of gold, silver and natural materials (minerals, rocks, organisms, etc.). ) has a certain value, collectively referred to as jewelry, so there is? Gold, silver and jewelry? Distinguish between gold and silver and jewelry. With the development of social economy, the concept of jewelry should be extended to include gold, silver and jewelry besides natural gems and artificial products. What are the industries that handle these goods collectively? Jewelry industry? . ? Jewelry? The scope of is wider than the broad scope? Gems? The concept of is much bigger. Gems in a broad sense generally refer to those raw materials suitable for polishing or carving into jewelry or handicrafts.
Jewelry appraisal method:
1, jade identification
As a high-grade jade, jadeite has a high price. Natural jadeite A, jadeite B treated by artificial glue injection and jadeite C are quite different in value. The market is full of artificially treated inferior jadeite. Dow filter can be used to illuminate a green jade. If it turns red, it can be said that this piece of jade is dyed, and it is true if it does not change color.
2. Diamond identification
Diamonds are the hardest natural substances. A diamond can carve any other gem, but no other gem can carve a diamond. The most accurate and reliable way to distinguish is to use? Thermal conductivity meter, measuring thermal conductivity data to distinguish between genuine and fake diamonds, but? Thermal conductivity meter is more expensive.
3, agate identification
Agate is generally recognized by the naked eye as the main means. Although modern technology is developed and there are many jade identification instruments, it is very inconvenient to use these instruments in the transaction process. Secondly, it can't solve the problem. The reason is very simple, and it will be limited by the environment. If we judge the quality and economic value of agate, the instrument will be useless. It is impossible to carry out complex instrument operation at the trading site, so naked eye identification is always an extremely important method. There are many kinds of agate, known as? Thousands of agates and thousands of jade? Therefore, there are many identification methods, and stripes, colors, transparency, cracks, impurities, sand cores and block weight are usually used as grading standards. In addition, water bile agate is the most precious, and harmonious and pretty raw materials are generally used as good products. The color of real agate is bright and bright, and the color of fake agate is poor, and the contrast between them is obvious. Natural red agate has distinct colors and obvious stripes. If you look closely, you can see tiny red dots densely arranged on the red belt. The fake agate hookah made of stone has mostly petal-shaped patterns at the bottom, which are intertwined. Chrysanthemum bottom? ; The dyed blue agate is bright and even, giving people a false feeling. Most fake agates are imitation stones, which are softer than real agates. Emerald can draw marks on fake agate, but real agate can't. There are few defects on the surface of real agate, and there are more inferior ones. The production technology of high-quality agate is strict and advanced, so the surface brightness is good, the inlay is firm and round, and there are no scratches and cracks.
4.sapphire
Sapphire is characterized by uneven color, undeveloped polycrystalline twins and strong dichroism. Sapphire produced in Myanmar is bright blue (titanium color) because the inclusion can produce six or twelve starlight. Sapphire from Kashmir, India, is a kind of high-quality sapphire, which is cornflower blue and indigo blue with bright color. Sapphires from Sri Lanka, Thailand, China and Australia also have their own characteristics. Sapphire is fragile, so you should avoid bumping and bumping when wearing it.
5, crystal identification
Rock crystals are clear and transparent, often containing cloud, star or flocculent gas-liquid inclusions, and often with microcracks. In addition, the rock crystal is polarized, and you can see the phenomenon of twin crystals, such as a crystal ball. Looking down from the top, there will be a double image. Synthetic crystal or glass products are uniform and pure in the body, without cracks, and often have small bubbles inside. Looking down at the sphere, you can't see the ghost of the line below. Through touch recognition, we can feel that the proportion of synthetic crystals is greater than that of rock crystals; Crystal stone feels cold and glass feels warm.