Jin Dafu's full English name is KINGTAIFOOK. Jin Dafu is called Jin Dafu Jewelry Group. The company was established in June 1997, and its headquarters is located on the 30th floor of Guo Mao Commercial Building, Luohu District. Its main products are inlaid ornaments, gold ornaments, jadeite and so on.
Jin Dafu Jewelry Co., Ltd. is a large-scale jewelry professional company mainly engaged in the production, processing, wholesale, retail and import and export of gold, K gold, platinum, diamonds, jadeite and other jewelry. Jin Dafu Jewelry Group covers four major jewelry brands: Jin Dafu, Jade Story, Meisha and Yulan Workshop.
Distinguishing skills of buying gold ornaments
1, look at the color
According to the different luster and color of gold, pure gold, k gold, real gold and fake gold can be roughly distinguished. That is, red and yellow are the best gold, and the purity is above 95%; The fineness of positive yellow is about 80%; Cyan accounts for about 70%; Yellow is light gray, and the fineness is about 50%. Therefore, there is a formula of "seven green, eight yellow, nine five red, yellow and white with gray and half gold".
Step 2 consider
By weight, the specific gravity of gold is 19.32, which is heavier than silver, copper, lead, zinc, aluminum and other metals. Because the volume of gold is more than 40% heavier than that of silver, 1.2 times heavier than that of copper and 6. 1 times heavier than that of aluminum. Gold jewelry should feel heavy in your hand, while fake gold jewelry feels light and floating. This method is not suitable for gold ornaments with precious stones.
3. Listen to the sound
When high-quality gold jewelry is knocked or thrown to the hard ground, it will make a dull and low sound of "poof-poof-poof-poof", which has no rhythm and elasticity. K gold has rhyme, sound and elasticity. The greater the elasticity, the sharper the rhyme, and the older the person, the worse the color. Fake or low-quality gold sounds crisp and dull, generally making a "Dangdang" sound, with a lingering sound, and violently beating after landing.
4. Bending hardness
Gold has the characteristics of ductility and low hardness, and can be pressed into thin sheets with a thickness of 12.7 microns. When the folding hardness is high and the color is dark, scratching with a pin or nail can leave traces.
More than 97% of colored gold jewelry is folded two or three times, and wrinkles appear at the bend, also known as fish scales; Gold ornaments with a fineness of about 95% feel hard when bending, and the scales are not obvious; About 90% of gold ornaments are hard when they are bent, and there are no scales.
Gold jewelry with many impurities will break after two or three bends; If it is made of gold, it will break when bent, and there are obvious sand grains on the cross section. When using this method, the width and thickness of jewelry should be considered. Thick and wide jewelry is harder, while thin and narrow jewelry is softer.