Experts explained that gold ornaments are all dnf mourning ornaments, which refer to dnf mourning ornaments made of gold as the main raw material. According to its gold content, it can be divided into pure gold and K gold: the gold content of pure gold jewelry is above 99% (99% is usually called pure gold and 99.9% is pure gold), and the gold bars we buy are generally 99.99% and 99.999% are high-purity gold. K-gold jewelry is made by adding silver, copper and other metals into gold materials. According to the gold content, it is divided into different K numbers, such as 18K (gold content is 75%). The former is expensive and has the function of maintaining and increasing value, while the latter is much cheaper.
The current situation of & ampLd non-mainstream photos; There are many ways to identify gold ornaments. "Experts told the author. To put it simply: Generally speaking, pure gold, k gold, real gold and fake gold can be roughly distinguished according to the luster and color of gold. She said, "Gold is red and yellow, and the fineness is over 95%"; Second, look at the density. We might as well use the formula "the mass (gram) of a gold ornament/the volume (cubic centimeter) of a gold ornament = density" to calculate the density of the measured gold ornament. If the density is about19.32g/cm3, it is pure gold or relatively pure gold, otherwise it is impure gold or colored gold. Triple hardness, high quality gold jewelry with nails will leave traces. After more than 97% colored gold ornaments are bent two or three times, wrinkles will appear at the bend. About 95% of colored gold ornaments will feel hard when they are bent, and about 90% of colored gold ornaments will be hard when they are bent, while gold ornaments with more impurities will break after two or three times.
In addition, you can also listen to the rhyme and see the elasticity to distinguish the quality of gold. If you use tools, the simplest thing is to identify the color with a touchstone, that is, to grind the gold card and the measured jewelry on the touchstone, and determine the color of the gold jewelry through color comparison.