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Identification of gold jewelry
(1) Look at the color: the higher the purity of gold jewelry, the darker the color. If there is no gold medal, the general fineness can be determined according to the following color (taking green gold as the criterion. The so-called green gold is that gold contains only silver); The fineness of dark red and yellow is more than 95%, that of light red and yellow is 90-95%, that of light yellow is 80-85%, that of cyan is 65-70%, that of cyan with white light is only 50-60%, and that of yellowish and white is less than 50%. The usual seven green, eight yellow and nine red can be used as a reference.
(2) Weight: the proportion of gold is 19.32, which is heavier 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. Gold ornaments should feel heavy when held in their hands, while fake gold ornaments feel light. This method is not applicable to gold jewelry inlaid with gemstones.
(3) Look at the hardness: pure gold is soft and low in hardness. It can make shallow marks with nails, and teeth bite can leave tooth marks. Gold ornaments with high fineness are softer than those with low fineness. The more copper, the harder. The bending method can also test the hardness. Pure gold is soft and easy to bend. The lower the purity, the harder it is to bend.
(4) Listen to the sound: when more than 99% of the real gold is thrown on the hard ground, it will make a sound, no rhyme and no elasticity. Fake or low quality gold has a crisp but no dull sound. It generally makes a 'Dangdang' sound, and the sound has a residual sound. It beats violently after landing.
(5) Burn with fire: burn the jewelry to be identified with fire red (do not melt and deform the jewelry), and observe the color change after cooling. If the surface is still the original gold color, it is pure gold; If the color darkens or darkens to varying degrees, it is not pure gold. Generally, the lower the color, the thicker the color, and all turn black, indicating that it is a fake gold jewelry.
(6) Look at the mark: domestic gold jewelry is purified and prepared according to international standards and marked with killing marks, such as' 24K 'indicating' full red 'or' full gold '; 18K gold, marked with the word '18K'. If the quality is lower than Lok, the K gold seal number cannot be printed according to the regulations. At present, criminals in society often make fake brands and imitation stamps, and use rare gold, Asian gold and even brass to pretend to be real gold. Therefore, to identify gold jewelry, we should comprehensively determine the authenticity and fineness according to the samples.