With the improvement of people's economic conditions, many people buy gold jewelry as an ornament, but as a gold jewelry jeweler, after buying gold jewelry, they are always worried about the purity of gold in the business, when it is a big head, then, How to distinguish the purity of gold jewelry?
1, view the color
Look at the color of gold appearance, as the saying goes, gold is "seven green, eight yellow, nine purple, ten red", because it contains different types of impurities and different compositions and different colors. Pure gold shines, and mixed gold has a little bit of trouble. The jewellery containing gold is 70% green, and the gold containing 80% is yellow. The gold-containing glutinous rice is yellow and transparent, and the gold content is 10%.
2, heavy
The proportion of gold is 19.3G/cm3, and the relationship between coloration and specific gravity is large. When the specific gravity is close to 19.3, the higher the pure gold. Whether it is commensurate with the size of the hand by the weight of the hand, the shape is large and light may be adulterated. But generally in the hands, if you feel a little sinking, you can feel that it is real gold jewelry, which shows that the gold body is small and heavy. Be wary of stupid and light ornaments, and carefully identify whether it is a fake or a fake.
3, try hard and hard
The higher the color of gold jewelry, the softer it is, the less elastic it is. The gold is bitten or needled with a light mark, and the hand is folded without broken lines. The low color steel is hard; the heavy blender is elastic, brittle and fragile. Pure gold is soft, generally not used for inlaid jewelry, so the inlaid gold ornaments claim to be 24K, there must be fraud.
3, try hard and hard
The higher the color of gold jewelry, the softer it is, the less elastic it is. The gold is bitten or needled with a light mark, and the hand is folded without broken lines. The low color steel is hard; the heavy blender is elastic, brittle and fragile. Pure gold is soft, generally not used for inlaid jewelry, so the inlaid gold ornaments claim to be 24K, there must be fraud.
5, reagent method
That is, try 45% nitric acid: gold, platinum, no change, silver, black, copper, green foam. This is because gold and palladium are chemically stable, are not oxidized under any conditions, and are very stable in water, air, hydrogen sulfide or salt, and alkali environments. Gold is hardly soluble in any single acid, only soluble in aqua regia (a mixture of hydrochloric acid and nitric acid in a ratio of 3 to 1).
6, check the stamping method
Gold jewelry produced by regular manufacturers is covered with gold and manufacturer's mark, such as cover 24K, 22K, 18K and so on.
If the ring on your hand is also gold, try the above method and get the same result as your ID data.
Cotton Fabric With Polyester Spandex,Polyester Cotton Spandex,Cotton Spandex Dobby,Nice Cotton Fabric For Coat
Shaoxing Sinofashion Textiles Co.,Ltd. , https://www.shownaturetex.com