2. Every product of Lao Fengxiang has a product-related certificate designated by a unique authority. The authenticity of the certificate can be inquired and identified in official website by referring to the certificate of the jewelry certification body through its serial number;
You can go to Lao Fengxiang's shop or counter, and the salesperson will help you identify it.
4. Laofengxiang Customer Service Center, 4th floor, No.432 Nanjing East Road, Shanghai Tel: (02 1)63220033
Three methods to identify diamonds:
1. Touch by hand. Touching the crystal face of a diamond gently with your fingers will give you a sticky feeling, which is unique to real diamonds, not fake diamonds. Because diamonds have affinity for oil, and the skin of human fingers will secrete some trace hand oil, this skin oil will be sticky when it comes into contact with the crystal face of diamonds.
2. use a pencil. This method was discovered by an expert in the former Soviet Union. Before identification, the diamond is soaked in water, and then the crystal face of the real diamond is gently scratched with a pencil, leaving no trace where the pencil is scratched. 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 magnifying glass with a magnification of 10. Under the magnifying glass of 10 times, most genuine diamonds can be found to have defects, such as triangular growth lines, and the diamond surface has "red, orange and blue" fire light. Radiant.
4. The same diamond 1 carat can be divided into excellent, good, very good, good, average and other grades, with different colors, cut and clarity, and different prices. Please pay attention when buying!
Three methods to identify platinum jewelry;
1. Body color identification method: Platinum is denser than gold, so it is easy to distinguish metals such as platinum and gold from each other by weight. Platinum jewelry with high fineness has a bluish white surface and a soft luster.
2. Mercury identification method: apply mercury to jewelry, so that mercury cannot be attached to real platinum.
3. Distinguish the truth with fire: burn the jewelry red with alcohol lamp. After cooling, the black component is about 70%, the gray component is about 90%, the platinum component of the same color is over 95%, and the black one is a fake.
Identification of Platinum composition The English translation of platinum is platinum, abbreviated as Pt or Plat, Pm. The jewelry industry mainly uses Pt to represent platinum. At present, the most common platinum ornaments on the market are Pt900 and Pt9500, that is, the platinum content is 90% and 95%. General manufacturers will make obvious marks on jewelry.
Three methods to identify gold jewelry;
(1) Look at hardness: pure gold is soft and low in hardness. You can draw shallow marks with your nails, and you can leave teeth marks after biting. Gold ornaments with high color are softer than those with low color, and the more copper they contain, the harder they are. Bending method can also be used to test hardness. Pure gold is soft and easy to bend, and the lower the purity, the more difficult it is to bend.
(2) Listen to the sound: When real gold with a purity of over 99% is thrown on the hard ground, it will beep, without rhythm and elasticity. Fake or low-quality gold sounds crisp and dull, generally making a "Dangdang" sound, with a lingering sound, and violently beating after landing.
(3) Burning with fire: Burn the jewelry to be identified with fire (do not melt and deform the jewelry), and observe the color change after cooling. If the surface is still golden, it is pure gold; If the color darkens or turns black to varying degrees, it is not pure gold. Generally, the lower the fineness, the thicker the color, and all of them turn black, indicating that they are fake gold ornaments.