Second, look at the density: We can calculate the density of the measured gold jewelry by the formula "mass (gram) of a gold jewelry/volume (cubic centimeter) of a gold jewelry = density". If the density is about19.32g/cm3, it is pure gold or relatively pure gold, otherwise it is impure gold or colored gold;
Third, folding endurance: High-quality gold jewelry will leave nail marks. After more than 97% 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 many impurities will be broken after two or three times.
Matters needing attention in determining the purity of gold:
When buying gold jewelry, in addition to the above simple methods to identify the purity of gold jewelry, of course, we should also choose some professional jewelry merchants with high credibility. If you want to buy gold jewelry in Shenzhen, I suggest you go to Luohu Shuibei International Jewelry Trading Center to find a regular company merchant. Here, I recommend several jewelry merchants that Bian Xiao thinks are more reliable, because they have all passed the trust transaction of China State Administration for Industry and Commerce and the designation of national e-commerce.
Public trust authentication system
, you can trade with complete confidence:
Shenzhen jinyuanxiang jewelry co., ltd
: Mainly engaged in color treasure inlay, K gold, gold, rings, tourmalines, diamond inlay, earrings, necklaces, etc.
Shenzhen zhaofeng jewelry co., ltd
Main silver ornaments: 925 silver, sterling silver, silver bracelets, silver rings, silver necklaces, silver jewelry and so on.
Shenzhen keya jewelry co., ltd
: Mainly engaged in jade jade, jade processing, jade wholesale, gold inlaid jade, ice jadeite and so on.
Shenzhen Rong Da jewelry co., ltd
Mainly engaged in silver jewelry, sterling silver, silver bracelets, silver rings, silver necklaces, silver pendants. Of course, if you want to join a jewelry store, Rong Da Jewelry is also a good choice.
Zhiduo d: types of gold jewelry
Gold jewelry refers to jewelry made of gold as the main raw material, which can be divided into pure gold and K gold according to its gold content: the gold content of pure gold jewelry is above 99% (99% is normal pure gold, 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.