Thousands of pure gold refers to thousands of pure gold with a gold content of not less than 999, which is the highest value in jewelry color naming.
When jewelry is made of precious metals with different materials or purities, the materials and purities should be indicated separately.
Thousands of gold with a gold content of not less than 999 is called thousands of gold, which is the highest value in jewelry color naming. The stamps are thousands of gold, 999 gold, 999 gold or g999 gold. The imprint of gold jewelry includes manufacturer's code, material and purity, such as X Gold 990, XAu990 and X Pure Gold. Where the letter X is the manufacturer's code. When jewelry is made of precious metals with different materials or purities, the materials and purities should be indicated separately. When jewelry is too thin or too small to print, it should be accompanied by a logo containing the contents of the imprint.
On the eve of the Spring Festival of 20 15, the National Standardization Administration Committee published the revision of GB 1187-2012 "Provisions and Naming Methods of Precious Metals in Jewelry", which took effect on May 4, 2000/6. In the future, even gold with a purity of 999.0‰ will be called "success" or "fineness". More than 200 years BC, the Greek mathematician Archimedes worried about judging whether a crown was made of pure gold. When he was taking a bath in the bathtub, he discovered what later generations called Archimedes' law of specific gravity: an object immersed in a liquid is subjected to upward buoyancy, and the buoyancy is equal to the weight of the liquid it displaces. Thereby successfully confirming whether the crown made by the king is made of pure gold. So, how to express the purity of gold? Theoretically, we call gold with a content of 100% 24K; ; Therefore, the calculation method is 100/24 (the national standard is in brackets): the national standard GB 1 1887-89 stipulates that the gold content per k (abbreviation of English carat and German carat, often written as "k") is 4. 16666%. 9k =100%/24 * 9 = 37.5% (375 ‰)14k =100%/24 *14 = 58.333% (585 ‰) is a sign of convenience. Set to 58.5%18k =100%/24 *18 = 75% (750 ‰) 22k =100%/24 * 22 = 91.60. Set to 9 1.6%. In theory, 100% gold can be called 24K gold, but in reality it is impossible to have 100% gold. Therefore, China stipulates that gold with a content above 99.6% (including 99.6%) can be called 24K gold. These kinds of K gold contents are general specifications of jewelry, and gold jewelry below 9K is not called gold jewelry according to national regulations. Thousands of pure gold: the gold content of not less than 999 is called thousands of pure gold, which is the highest value in jewelry color naming. The stamps are thousands of gold, 999 gold, 999 gold or g999 gold. Pure gold: pure gold with a gold content of not less than 990. The stamps are pure gold, 990 gold, 990 gold or g990 gold. The gold content of jewelry is an important indicator of its quality. There are many methods to test gold content, which can be divided into chemical analysis and instrumental analysis. According to whether jewelry is damaged in the process of testing, it can be divided into nondestructive testing and destructive testing. In the daily inspection of jewelry quality supervision department, nondestructive testing is the main method, and density method is combined with X-ray fluorescence spectrum, electron probe and other large instruments for analysis. Damage detection is the main method of market supervision and spot check, and fire assay is the national detection method for determining the gold content of jewelry. The price of gold jewelry is calculated according to the weight and processing fee, and the weight of jewelry is one of the important indicators. According to the standard, the weight of jewelry is measured in grams, and the tolerance of a single piece of gold jewelry is 0.01g. Thousands of pure gold-the difference between pure gold and thousands of pure gold to buy gold jewelry, we must first recognize the quality inspection marks of gold jewelry. Most of the gold ornaments sold in the market are equipped with inspection marks of quality inspection institutions, which clearly indicate the gold content and weight of the ornaments. 999 gold is also called thousands of gold, and the gold content is not less than 999 ‰; 990 gold is called pure gold, and the gold content is not less than 990 ‰; The gold content of 22K gold is not less than 916 ‰; 18K gold has a gold content of not less than 750 ‰; 14K gold has a gold content of not less than 585 ‰; The gold content of 9K gold is not less than 375‰. Pure gold: Gold with a gold content equal to or greater than 99%, commonly known as "Erjiu Gold". The printed logo is "pure gold", or "99 gold" or "G99". Thousands of pure gold: gold with a gold content equal to or greater than 99.9%, commonly known as "Sanjiu Gold". Printed as "Thousands of Gold", "999 Gold" or "It is especially necessary to remind consumers that 18K gold jewelry has three colors: yellow, white and red. White 18K gold is an alloy of gold and nickel, zinc, silver, copper and other elements, while platinum jewelry is not platinum (platinum) products. The imprint of gold jewelry includes manufacturer's code, material and purity, such as X Gold 990, XAu990 and X Pure Gold. Where the letter X is the manufacturer's code. When jewelry is made of precious metals with different materials or purities, the materials and purities should be indicated separately. When jewelry is too thin or too small to print, it should be accompanied by a logo containing the contents of the imprint. How to choose thousands of gold jewelry with good color? There is a formula to identify the pure gold in cooked gold, that is, weigh it, look at the color, judge the rhyme, fold it soft and hard, and use acid. Because the density of gold is obviously higher than common metals such as copper, silver, lead and zinc, it is about twice as heavy as silver and copper with the same volume. If the object is gold and feels heavy, it is a "golden pendant" of the human system, and vice versa. Thousands of pure gold has its unique golden luster (except for low fineness). Pure gold will shine brilliantly in strong light, which other metals, including copper, do not have. Thousands of gold with high color have no rhyme and elasticity when thrown on the ground, while thousands of gold with low color have slightly brighter sound quality, and copper products have a loud sound when thrown on the ground. Therefore, according to the sound of knocking objects, it can help us distinguish ordinary metals from gold. Thousands of pure gold has the characteristics of good ductility and low hardness. Pure gold is very soft to fold, and copper bars are very laborious to fold. Or draw it with a pin (nails can also be used). If the strength is not great and the trace is obvious, it is gold and pure gold, and the copper is slightly harder and the trace is slightly worse. Soft folding and hard folding are only applicable to rings, gold wires and the like, and gold bars, gold coins and gold bricks are more difficult. It is also very effective to judge the authenticity of gold with a grinding head, but it is necessary to polish the inspected object in different directions. If the colors of several grinding channels are obviously different, there is no doubt that they are adulterated. If you don't believe in the above methods of identifying mature gold, you can only use nitric acid to judge the authenticity, that is, use nitric acid to point its wear marks. For a long time, solder has been used to make thousands of gold jewelry. The use of welding solder causes the shortage of gold content in jewelry as a whole, and also saves the cost for manufacturers. The use of welding solder directly determines the overall purity and value of jewelry. Please choose a regular manufacturer when buying thousands of gold to ensure the value of jewelry. Solderless pure gold completely solves the problem of using solder, and consumers can buy it on the basis of solderless. 201March 15, March 15 party exposure, the content of thousands of gold sold by gold counters in some shopping malls is not up to standard. In Shenzhen Shuibei Jewelry City, the reporter witnessed the whole process of adding low-priced metal iridium to gold in jewelry processing industry, and learned that jewelry processed from iridium-containing gold will be supplied to the gold counters of some shopping malls. Note: Although gold has a high durability, if you don't know how to love jade, there will still be scratches or pits on the surface of gold jewelry, especially jewelry worn on your hands, such as rings and bracelets. So remember to take off the gold jewelry before doing strong activities. Watch out for chemicals. The natural enemy of gold is liquid chlorine. Repeated exposure to chlorine will weaken the internal structure of gold and eventually lead to fracture. So keep your gold jewelry away from chlorine-containing detergents, swimming pools and bathtubs. The acid, abrasive and other chemical components contained in household cleaning liquid will damage the luster of the surface of gold jewelry, so remember to wear rubber gloves when cleaning with heavy tasks, and of course it is best to remove them. Gold jewelry has been polluted by cosmetics such as sweat, dust and perfume for a long time, and it is easy to lose its original luster. It should be cleaned regularly. You can wash it with mild soapy water or go to a professional jewelry store for steam washing. After cleaning and rinsing, be sure to wipe it with a suede or clean soft cloth to avoid scratches. Proper storage is as important as cleanliness. When not in use, put it carefully in the jewelry box-it is best to wrap a soft cloth-and it is best to store all kinds of jewelry separately to avoid entanglement or friction. 6. Check whether the gold jewelry is cracked or damaged at any time, especially the retaining ring-elastic, safe and reliable; Claw-avoid breaking, bending or loosening, and prevent the gem from falling off; Earrings and needle backs-avoid bending or loosening, and the joints of long-term hanging ornaments such as wedding rings and pendants. Appraisal people often use touchstones to determine the approximate content of gold. Touchstone is a mixed black carbonaceous mineral such as timely and opal. Draw a stripe on the touchstone to see the approximate fineness of gold. Whether it is natural gold or gold products, its color will change with the ingredients contained. Pure gold: shiny deep yellow, thick yellow; Silver-bearing gold: light color change, microstrip light green; Gold containing more than 25% silver: earthy white; Copper-bearing gold: the color is dark and the tone is red; Gold containing silver and copper: yellow; Gold containing zinc, copper and nickel: platinum. [3]? Look at the color of gold. The higher the purity of gold jewelry, the darker the color. In the absence of a gold medal, the general fineness can be determined according to the following colors (based on cyan gold). The so-called green gold is just silver in gold); The fineness of deep red yellow is above 95%, light red yellow is 90-95%, light yellow is 80-85%, turquoise is 65-70%, turquoise with white light is only 50-60%, and yellowish white is less than 50%. Looking at the weight of gold, the specific gravity of gold is 19.32, which is heavier than silver, copper, lead, zinc, aluminum and other metals. Because the volume of gold is more than 40% heavier than that of silver, 1.2 times heavier than that of copper and 6. 1 times heavier than that of aluminum. Gold ornaments should feel heavy in your hand. 18k gold pendant, fake gold ornaments feel light and floating. This method is not suitable for gold ornaments with precious stones. Look at the hardness of gold. Pure gold has a soft texture and low hardness. It can draw shallow marks with nails and bite out tooth marks with teeth. In golden island, gold ornaments with high colors are softer than those with low colors. The more copper, the harder it is. Bending method can also be used to test hardness. Pure gold is soft and easy to bend. The lower the purity, the harder it is to bend. Discrimination of gold jewelry: gold jewelry refers to jewelry made of gold as the main raw material. The chemical symbol of gold is Au, with a specific gravity of 19.32 and a Mohs hardness of 2.5. ?