It's true. The gold in ordinary shops is real. Leofoo gold is pure gold, while Leofoo Jewelry Co., Ltd. specializes in the design, production and operation of diamonds and gold inlaid jewelry, so Leofoo gold jewelry has a steel seal mark to prove whether it is pure gold. Generally speaking, there will be a "CLF" logo inside jewelry, which refers to the brand logo, the initials of Zhou Pinyin, and C also stands for China. In addition, Leofoo's gold jewelry will be tested by relevant international departments at the time of purchase. If you want to see if the certificate is standardized, you can go to the local authoritative jewelry testing agency or technical supervision bureau for testing.

: golden section method

Look at the color: the higher the purity of gold jewelry, the darker the color. In the absence of a gold medal, the overall color can be determined according to the following colors (based on green gold). The so-called green gold only contains silver), more than 95% is crimson yellow, 90-95% is light red, 80-85% is light yellow, 65-70% is green yellow, only 50-60% is green white, and less than 50% is slightly yellow white. Generally speaking, seven greens, eight yellows and nine reds can be used for reference.

Weight: The specific gravity of gold is 19.32, which is heavier than silver, copper, lead, zinc, aluminum and other metals. By volume, 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 in your hand, while fake gold ornaments are light. This method is not suitable for gold ornaments with precious stones.

Observe the hardness: pure gold is softer, the hardness is lower, fingernails can draw shallow marks, teeth bite marks can leave tooth marks, high-color gold jewelry is softer than low-color, the more copper, the harder it is to bend, and the bending method can also test the hardness. Pure gold is soft and easy to bend, and the lower the purity, the more difficult it is to bend.

Listen: Real gold with a color above 99% will make a sound when thrown on hard ground. The sound doesn't rhyme and has no elasticity. Fake or low-color gold tones are crisp and dull, generally making a "Dangdang" sound, and the sound echoes around the beam, and slamming after landing.

Burning: Burn the jewelry into red (do not melt the jewelry), and observe the color change after cooling. If the surface is still pure gold and the color is dark or black to varying degrees, it is impure gold. Generally speaking, the lower the color, the thicker the color, all black, indicating that it is fake gold jewelry.

Look at the logo: domestic gold ornaments are made according to international standards. If the word "18K" is added after "24K" is marked as "Zuchi" or "Gold", its color will be lower than that of Le according to the stipulation of K-Gold seal number. At present, criminals often make fake brands, copy stamps, and pass rare gold, sub-gold and even brass off as real gold. Therefore, the identification of gold ornaments should be based on samples, and the authenticity and color scale should be comprehensively judged.