Identification of Laofengxiang gold

1. All authentic products of Laofengxiang are attached with the exclusive seal of "Laofengxiang", which can be seen from the printing technology
2. Each product of Lao Fengxiang is issued with a unique authoritative product related certificate. The authenticity of the certificate can be checked and identified on the official website of jewelry certificate and authoritative certificate inquiry by using its number reference
3. You can go to Laofengxiang store or counter and have the salesperson identify it for you
4. Laofengxiang customer service center, 4th floor, No. 432 Nanjing East Road, Shanghai Tel.: (021) 63220033

three ways to identify diamonds:
1. Touch with your hand. When you touch the crystal surface of a diamond with your fingers, you will have a feeling of stickiness, which is unique to real diamonds but not fake diamonds. Because diamonds have a affinity for oil, and the skin of human fingers will secrete a small amount of hand oil, this skin oil will feel sticky when it contacts the crystal surface of diamonds
2. Use a pencil. This method was discovered by an expert of the former Soviet Union. Before identification, the diamond should be moistened with water, and then gently scratched on the crystal surface of the real diamond with a pencil. There is no trace left where the pencil crosses; But if it is a fake diamond made of glass, crystal and other materials, it will leave traces
3. It can be observed through a 10x magnifying glass. Under a 10x magnifying glass, most genuine diamonds can see defects, triangular growth lines, and "fire" light of "red, orange, blue" and other colors on the surface of diamonds. It shines in all directions
4. The same 1-Carat diamond can be divided into excellent, good, good, good and average grades. The color, cut and clarity are different, and the prices between them vary a lot. Please pay attention when you buy

there are three methods to identify platinum jewelry:
1. Body color identification method: platinum is denser than gold, so it is easy to distinguish platinum from gold and other metals in terms of weight. The surface of platinum jewelry with high fineness is cyan white with soft luster
2. Mercury identification method: smear mercury on jewelry, and you can't make the mercury adhere to real platinum
3. Distinguish the truth by fire: burn the ornaments red with an alcohol lamp. After cooling, the components that turn black are about 70%, the components that turn gray are about 90%, the components that remain the same color are more than 95%, and the components that turn black are fake products
the English translation of platinum component identification platinum is platinum, which is abbreviated as Pt or plat, PM. The jewelry industry mainly uses PT to represent platinum. At present, PT900 and pt9500 are common platinum jewelry in the market, that is, the platinum content is 90% and 95%. Generally, manufacturers will make clear marks on jewelry

three ways to identify gold jewelry:
(1) look at hardness: pure gold is soft and low in hardness. It can make shallow marks with nails, leave tooth marks when teeth bite. Gold jewelry with high quality is softer than gold jewelry with low quality. The more copper it contains, the harder it is. Bending method can also test hardness. Pure gold is soft and easy to bend. The lower the purity, the harder it is to bend
(2) listen to the sound: when real gold with a fineness of more than 99% is thrown on the hard ground, it will make a popping sound without rhyme or elasticity. The false or low-quality gold sound is crisp without dullness. It usually makes a "Dangdang" sound, and there are aftersounds. It beats violently after landing
(3) burn with fire: burn the jewelry to be identified red with fire (don't melt and deform the jewelry). After cooling, observe the color change. If the surface still shows the original gold color, it is pure gold; If the color becomes dark or black to varying degrees, it is not pure gold. Generally, the lower the fineness, the thicker the color, and all of them turn black, which indicates that they are fake gold jewelry

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I bought Lao Fengxiang bracelet. There is a letter behind the words Lao Fengxiang. I'm worried about whether I've bought a fake. I don't know how to identify the authenticity