Gold identification method

Identification of gold ornaments

Identifying gold requires some experience. Here is a brief description of some of the authentication methods.

(1) Look at color: The higher the purity of gold jewelry, the darker the color. In the absence of a gold medal, the general color can be determined according to the following shades (in the case of green gold. The so-called green gold is gold containing only silver components); deep reddish-yellow color is more than 95%, light red-yellow 90--95% The pale yellow color is 80--85%, and the greenish yellow color is 65-70%. The color green with white light is only 50--60%, and the yellowish white color is less than 50%. The commonly referred to as Qiqing, Huanghuang and Jiuchi can be used for reference. (2) Weight: The proportion of gold is 19.32, which is more important than silver, copper, lead, zinc, aluminum and other metals. As the volume of gold is more than 40% heavier than silver, 1.2 times heavier than copper and 6.1 times heavier than aluminum. The gold ornament should be in the hands of sinking, fake gold jewelry will feel light. This method does not apply to gold jewelry with a gemstone.

(3) See the hardness: pure gold is soft, the hardness is low, can use the nail to be able to draw the shallow mark, the tooth bite can leave the tooth mark, the high quality gold ornament is softer than the fineness, the copper contains more hard, the bending method Can also test the hardness, pure gold is soft, easy to bend, the lower the purity, the more difficult to bend.

(4) Listen to the sound: When the fineness of 99% or more of real gold is thrown on a hard ground, it will make a buzzing noise, no sound and no elasticity. Fake or low-tone gold sounds are brittle without sensation of dullness, and generally sound “dang-dang” sounds and sounds that are reverberations.

(5) Use fire to burn: Use the fire to identify the jewelry red (do not make the jewelry melting deformation), observe the color change after cooling, if the surface is still the original gold color is pure gold; if the color becomes darker or varying degrees of black, It is not pure gold. The lower the general color, the darker the color, all black, indicating that it is a fake gold jewelry.

(6) Look at the mark: domestic gold jewelry is refined and formulated according to international standards, and marked on the mark, such as "24K" marked "foot red" or "full gold"; 18K gold, marked "18K", low quality For loK, according to the regulations, you can't hit the K-print. At present, criminals in society often use counterfeit and counterfeit stamps to impersonate gold with rare gold, gold, and even brass. Therefore, gold jewelry must be judged based on samples to determine whether it is genuine or not.