Hong Kong Jinliufu Jewelry Co., Ltd., English name: HONGKONG J.L.F BIJOUTERIE LIMITED, established in 2006, is located in the Hong Kong Special Administrative Region. The company's main business includes gold, jewelry, jewelry sales and brand promotion. The company has an R&D team of more than1000 people and an independent R&D system, which drives the R&D, design and production of more than 10000 new products and nearly one million style library resources every year. The product line covers all kinds of gold jewelry.
Hong Kong Jinliufu Jewelry Co., Ltd. has been focusing on deepening the jewelry industry, developing different styles of jewelry based on the needs of young people, and integrating sales through online and offline channels. Integrate the company's superior resources, promote the company's brand, recruit agents from all over the country, and help partners develop in all directions.
How to choose gold correctly
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". For jewelry that has been hidden for a long time, there is a saying that "copper turns green, silver turns black, and gold never changes color".
Step 2 look at the density
The density of gold is 19.32g/cm3, which is about twice as heavy as that of silver, lead and tin with the same volume. Available formula: the mass (gram) of a certain gold jewelry is equal to the density compared with the volume (cubic centimeter) of a certain gold jewelry. Calculate the density of the measured gold jewelry. If the density is about 19.32g/cm3, it is pure gold or relatively pure gold, otherwise it is impure gold or colored gold (this method is not destructive to jewelry).
3. Listen to the rhyme to see the elasticity.
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", which has no rhythm and elasticity. K gold has rhyme, sound and elasticity. The greater the elasticity, the sharper the rhyme and the worse the quality.
4. Identify colors with touchstones.
The color of gold jewelry is determined by grinding the gold card (the gold medal whose color has been determined) and the measured jewelry on the touchstone and comparing the colors. The method should be carried out under natural light and fluorescent lamps, not under direct sunlight and incandescent lamps.
The above contents refer to Baidu Encyclopedia-Hong Kong Jinliufu Jewelry Co., Ltd.