Jewelry refers to raw materials and semi-finished products of jewelry, jade and precious metals, as well as wearing ornaments, craft ornaments and art collections made of raw materials and semi-finished products of jewelry, jade and precious metals. After just a few years' development, China's jewelry market has jumped from only 1% of the world in previous years to the forefront of the world, second only to the United States and Japan.
Jewelry appraisal method:
1, jade identification
1 texture. Natural jadeite is transparent or translucent in texture, and its surface is bright and shiny. If you look closely, you can see the nearly round and slightly transparent "salt particles" and the fibrous substances around them.
② Hardness. Natural jadeite is jadeite, and its Mohs hardness is 7 degrees. It will be carved by a sharp knife without leaving any trace. The hardness of fake jade is low, so a sharp knife can draw it out.
3 Emerald. When natural jadeite is observed under strong light, emeralds with other mineral particles can be seen, which are called Cui Hua or emeralds. Fakes made of glass, plastic and porcelain have no such "emerald" characteristics.
④ Relative density (specific gravity). Natural jadeite has a hard and dense structure, no bubbles, high density, and clear sound when knocking; Fake products have loose structure or bubbles, low density and hoarse knocking sound.
⑤ color. The real product is rich and pure emerald color. Some fakes are made of white jade, serpentine, Australian jade, Han Guoyu, marble and even various stones. After decoloring, it is filled with high-hardness plastic slurry and colored, or soaked in green liquid to make "colorful jade". Observing under strong light, you can see green lines, which are messy and small; Some do not show lines, but they are not clear, with poor gloss and lighter weight than the real thing.
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 identify genuine and fake diamonds is to measure the thermal conductivity data with a "thermal conductivity meter", but the "thermal conductivity meter" is expensive.
3, agate identification
Nau can be identified mainly from the color, texture, transparency and thickness of patterns. High-quality agate has bright surface and clear stripe pattern, while fake agate is not bright enough and the color is too single. High-quality agate is hard and has few surface defects, while fake agate is soft and easy to leave scratches. Real agate has low transparency, while fake agate has high transparency.
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.
Step 6 identify pearls
To identify whether pearls are real or not, you can bite them with your teeth. If they don't feel smooth after being bitten and the nacre doesn't fall off, it means they are real. In addition, pearls can rub against each other. If the pearl surface is uneven and fuzzy, it will lose powder, and so on. From the hand feel, natural pearls give people a cool feeling when held in their hands, but after being held for a period of time, the temperature of pearls will change with the body temperature. But fake pearls will not feel obvious coolness, and the feeling in hand is greasy.