On the market before selling gold jewelry, gold jewelry into gold and k , according to the provisions of national standards gb11887 , several common gold jewelry content :

1K = 4.1666%
24k - currently on the market occasionally marked with 24k gold jewelry, according to national standards , 24k gold content of the theoretical value should be one hundred percent , no gold barefoot , so strictly speaking , 24k does not exist , marked 24k gold sales is incorrect , does not meet the national standards.
Thousands of gold - content of 99.9% , commonly known as three 9.
Gold - content of 99.0% , or more commonly two 9 .
18k - content was 75.0%, k gold color variety , usually yellow, red, white points. Where k white gold is actually an alloy of gold and nickel, zinc , copper and other elements. It is not commonly referred to as platinum jewelry.
How to distinguish between true and false when buying jewelery and quality?
  a check mark
  national standards, there is precious metal jewelry should play origin, manufacturers, material and content of the mark, no imprint products for substandard products. If a quality problem detection inspection agency may grant judgment based imprint. Consumers need to buy their own brands and different according to the mark with

Kim amount of gold jewelry.
  Second, sensory testing method :
  1, see color: dark yellow gold , k gold yellow, red , and white multicolored , and imitation gold products , mostly copper alloys, lighter in color .
  2, weigh Weight: gold accounted for 19.3g/cm3 much higher than the proportion of imitation gold products , such as a very pure gold ring is about 5 grams , while the same size imitation gold products generally less than 3 grams.
  3, hardness test : gold is relatively soft, with a pin to scratch , with the teeth to bite with teeth marks.
Third, the need to accurately know the precious metal content , such as jewelry or a quality dispute should go to the jewelry tool inspection agency , the use of physical or chemical analysis methods were identified . Need to carefully check when buying jewelry insets, welding is solid without fracture , glitches , such as trachoma .
Jewelry Maintenance : jewelry store when worn and should be avoided and contain lead , mercury exposure items (mercury ) and other elements , or make jewelry surface discoloration . Work, take a shower when the jewelry is removed , to prevent wear and tear or bump , not to pull hard to avoid deformation or fracture .
After the jewelry worn for some time, there may be dirt, color, dark, dish detergent , etc. can be used to soak , scrub gently with a soft brush , rinse with water , you can wear dry .
Platinum ( Platinum ) Jewelry Basics
  platinum also known as platinum, chemical element symbols pt, silver-white precious metals, gold is slightly higher than the hardness , density 21.45g/cm3 (20. C ), the melting point of 1768 . c, it has many excellent features , such as corrosion , oxidation, and beautiful colors , etc. , because these platinum

Features , both individually or made into fine shape, posture tough platinum jewelry can also be used to make beaded jewelry tools, especially colored diamonds flashing fire , perfect match , complement each other in the bottom bracket on platinum inlay , is the current Most jewelry.

  At present , the common market of high-end jewelry with diamonds , rubies , sapphires , emeralds, high-quality cultured pearls, gemstones mid garnet , amethyst , gold, topaz and so on. The past two years , coral , malachite, turquoise , Tanglin jade stone decorations also became popular.
False identification   gem has been a matter of concern to consumers . Buy gemstone jewelry, to a regular jewelry store or the mall jewelry counter to buy , the quality is guaranteed . If a quality problem or doubt , ask the expert advice or to identify the relevant inspection bodies .
  What most precious gem ? For that matter, can not be generalized , but according to the value and scarcity of the natural stones , the international jewelry industry recognized varieties of precious stones with diamonds , emeralds , rubies , sapphires, emeralds gold for Asians , the emerald is also listed

Into them . But what ’s most precious gem which ? It may, depending on the specific situation is . The value of gemstones , gemstone itself depends on the quality and rarity extent . Gems in each category , there will be more rare precious stones. For consumers, according to their own preferences

, The purchasing power to buy .
  With the popularity of diamonds , diamonds concern people have is not limited to true and false identification , but the quality of the diamond grading . Usually 4c international principles, namely :
  Carat weight : 1 karat equals 200 milligrams.
  Clarity: divided fl, if, vvs, vs, si, i six levels, the market is more common si-vvs grade .
  color: from d, e, f, lln and   Cut: divided into good , good, fair .
  understanding of diamond grading knowledge will help available price, the quality is quite reasonable diamonds.
Colored gemstones such as ruby , sapphire , etc., depending on the quality of its color , transparency, flaws, cutting and other factors . Cleaning gemstone jewelry , generally take a bowl of warm water, add a small amount of detergent , scrub with a small brush lightly moistened with water , then rinse , dry cloth and then water

Points, soft raw silk cloth. Gemstone jewelry store , be careful not to place all the jewelery tools in a box at the same time , because the jewelry inlaid jewelry will rub against each other , causing damage and loss of luster gems .
Bear in mind that the standard measure of a diamond ’s quality -4c
  "4c" is you determine a diamond ’s value and quality metrics . The so-called "4c" that is, four English words beginning with c abbreviation refers to a diamond ’s carat weight (carat weight), clarity (clarity), color (colour), cut (cut). Just consolidated

Aggregate value and quality "4c" four-point to appreciate , you can easily understand a diamond . Diamond Price = weight + color + Clarity + cut.
Carat weight (carat)
  diamond carat weight to calculate . 1 kt = 200 mg = 0.2 g . One karat divided into 100 copies , each copy is called a sub- 0.75 carat 75 points , 0.09 carat nine points. Under other conditions similar circumstances, with the increase in the weight of the diamond , the value of growing exponentially ;

The same diamond weight will vary color, clarity, cut workers and the value far.
Clarity
  diamond crystallization in the depths of the Earth’s mantle magma , after millions of years of geological changes , which contains all kinds of debris and internal inevitably flawed . Color of these inclusions , the number , size and location distribution of Diamond Clarity constitute different degrees of impact . Usually 10 times magnification

Mirror on the diamond surface blemishes and clarity grades will not impact on the brilliance of diamonds subdivided into lc, vvs1, vvs2, vs1, vs2, si1, si2, p1, p2, p3 total of 10 levels.
Color
  There are a variety of natural color diamonds . The precious colorless ( after cutting and grinding white ) , rare light blue , pink to light yellow common range . The more transparent and colorless , the more white light can penetrate , after refraction and dispersion is colorful .
Diamond color grading in a professional laboratory environment classification by technical personnel will be standard color grading diamonds and colored stones repeated contrast ratio determined . Diamond color is divided into 11 levels , in turn divided into : d, e, f, g, h, i, j, k, l, m, n.
Cut
  diamond shining bright thanks to its unique high refractive index and high dispersion performance. Diamond is the hardest substance , no firm can destroy , never worn , an eternal glory by cutting and grinding it . Determine the merits of the diamond cut method : Pick up the diamonds, staring at the top of the light beating , beautifully turner

The dazzling brilliance of diamonds , not because of the different styles and inlay or CLS 1971. Level turner is: very good , good, fair .

Knowledge gold jewelry summary ( details can go gold sister network to see ! )
( 1 ) Look mark : Now China manufacturers of gold jewelry tools are prepared from purified by international standards , and to be marked with a k to represent the number of metal products in gold content . Gold is 24K, gold of 99.6%; 22K gold content of 91.3%; 20K gold content is

83.3%; 18K gold content of 74 7%;. 14K gold content of 58.5%; 9K gold content of 37 5%;. 8K gold content of 33 3%;. 1K gold content of 4.166% . According to words such as 24K or 18K mark on , you can know how the jewelry couplers , but press

Provisions do not play less than 10K K gold printed numbers.
  ( 2 ) see color: the higher the purity of gold jewelry in general , the darker the color. As is often said that "seven nine eight yellow green red purple ten ," that if gold was green yellow , gold up 70% ; yellow gold content of up to 80-90 % ; If you were red yellow and gold content of up to 95 or more. Of course

, Only with color discrimination fineness of gold jewelry , real is not enough .
  ( 3 ) weigh weight : the proportion of gold is 19.3 , higher than other metals. The same volume of gold, silver weight was 1.8 times , 2.2 times that of copper . Therefore, the real gold in the hands of care should feel heavy , fake gold will feel lighter .
  ( 4 ) listen to the sound : the gold ornaments thrown to the desktop, or throw on a hard floor, the lower the gold content , the greater the flexibility, jump higher , crackled , and there are lingering ; gold higher elasticity smaller the lower the jump , the sound of low stuffy , heavy , and no lingering .
  ( 5 ) test hardness: the higher the gold jewelry is soft, it is easy to bend by hand , good toughness, not easy to break , scored with a hard thing will stay clear of scratches ; the lower gold content the more hard , you need to use a larger effort to bend move, but easily broken, when scored with a hard thing , no scratches

Obvious.
  ( 6 ) the scientific testing : First fire way to identify. The jewelry on smokeless fire burning, burning gold after the color change ; darken or black for fake gold or insufficient purity . Second, the chemical method . With a concentration of 45 % or 70 % sulfuric acid -point try, gold unchanged , maintaining the original

Kind ; silver black ; copper to take the green bubble . Because silver , copper and other metals were dissolved in acid , a chemical reaction occurs .
  
How to prevent discoloration of gold jewelry
People wearing gold jewelry after a period of time, found discolored or faded , many people think that this is insufficient fineness of gold jewelry , then store representations or complaints to the Consumers’ Association , however, has faded gold jewelry is not accused of fineness of gold jewelery enough , but for other reasons

, Then this is exactly what causes it ?
  Discoloration or fading with human sweat gold jewelry has a close relationship. 99% of people ’s sweat is water , the other is about 1% of the human body’s wastes and hazardous substances , such as: chlorides , lactic acid, urea and ammonia. After exposure to these substances silver and copper and gold jewelry , it will produce

Chemical reaction to produce copper sulfide and silver chloride , and showed dark chemical salts. The chemical salts often fall from the gold jewelry , the wearer’s skin contamination that left very distinct black stains on the skin.
  Cosmetics now has become one of people’s lives indispensable "role ." If applied in the gold jewelry worn parts of the skin , then no doubt and fear to cosmetic chemical erosion gold jewelry contain chemical substances " foes head" provides the opportunity , the result can be imagined .

Some cosmetics , it also contains some fine durum , which can constitute another type of dirt, so wear gold jewelry . Regional Environmental factors may also make gold jewelry lose bright color . For example : more dry areas where the air contains many of the original fine dust , contaminated Master

Will form a "human sandpaper " after the body , it can put a gold jewelry tools very fine abrasive debris , such as a partial black stain . It is worth mentioning that talcum powder or moisturizer also contains similar particles, as these will make gold jewelry as eclipsed.
Gold jewelry maintenance
Gold jewelry is priceless and timeless . For thousands of years , many people have been attracted by its charm will never fade away . Although there are various colors of gold jewelry , but improper handling will make it dull. Here are a few points to save gold jewelry.
  As a precious metal , gold jewelry usually do not suffer because of soap , sweat and pollution and other items in everyday applications tarnish , fade or pollution. In fact, the normal daily oil also cause a slight decrease in the brightness of gold jewelry . So it is best not to wear the gold in the first

Before wiping tools and other decorative perfume or creams, as this could affect it . Also, wash your hands before you should take off gold jewelry , in order to maintain its luster.
  Today jewelry cleaning cloth is also a very good choice, it not only protects against dirt jewelry
  Dye , and make it as good as new . So have enough cloth to wipe off the dirt . Avoid contact with soap and jewelry chlorinated water .
  
Buy gold jewelry
In addition to ensure the quality of gold jewelery shops to buy big , we should also pay attention to the following four points :
  1 have a formal tax invoice , marked: jewelry name , color, weight. For future inquiries ;
  2 , according to their age, temperament, body and purchase motivations purchase. Currently sold in jewelry stores , mostly in Shenzhen , Guangzhou, jewelry, tools area , which is characterized by fashionable and nice, but not necessarily high purity ; There Zhejiang production of jewelry, more traditional style of ,

But gold is relatively high ;
  3 jewelry should be carefully examined whether the glitch , the body is straight chain , buckle, joints, ear clips , etc. are safe. To make bracelets buckle , earring connectors, top parts of the ear more securely , these parts of the couplers are lower ;
  4 when wearing jewelry sometimes white, this is because when jewelery and cosmetics , shampoo , detergent , or mousse contact , chemical reaction , so the wear process should also avoid contact with cosmetics, once , he may invoice requirements shops resolved. When the usual jewelry store

, Preferably with a soft cloth , put each piece of jewelry is packaged separately to avoid friction , resulting in losses.
  
Identification of gold jewelry
Identification of gold need to have some experience. Briefly describes some methods of identification . But it is best to go gold shop !
  
( 1 ) see color: the higher the purity of gold jewelry , the deeper the color. In the absence of the gold fineness generally determined according to the following color (in green gold as a criterion called green gold is only gold and silver contained in the ingredients. ) ; Deep red yellow purity above 95% , light red yellow 90 - 95% , yellow

80 - 85% , 65-70 % greenish yellow , the color blue with white only 50 - 60% , yellow and white to 50% of not . Commonly referred to as the seven green , eight yellow, nine red for reference. ( 2 ) weigh weight : the proportion of gold is 19.32 , emphasis on silver, copper , lead, zinc , aluminum and other metals. As

The weight ratio of the volume of gold with more than 40% silver , copper weight ratio of 1.2 times 6.1 times heavier than aluminum . Gold jewelry due care in the hands of a sense of Shen fall , fake gold jewelry will feel buoyant . This law does not apply to gold jewelry studded with precious stones .
  
( 3 ) Look hardness: soft gold , low hardness, can draw light marks with a nail , teeth bite can leave teeth marks , high purity lower than the fineness of gold jewelry is soft, the more rigid copper , bending method hardness test can , gold is soft and easy to bend , the lower the purity, the more difficult to bend.
  
( 4 ) listen to the sound : more than 99 % of the fineness of gold thrown into the hard ground , will issue a pair of clicking sound , there is no rhyme nor sound stretch . Fake or low- fineness gold crisp sound without boring sense , the general issue " Dangdang " sound, but the sound has a lingering , beating vigorously after landing .
  
( 5 ) with fire : the fire will be identified with a red-hot jewelry ( do not make jewelry melted deformation ) , observe the color change after cooling , such as the surface is still on the original gold color gold ; such as color darker or different degrees of black, it is not pure gold. Generally lower fineness, darker color , all black

, Indicating a fake gold jewelry.
  
( 6 ) Look mark : Domestic gold jewelry are formulated into purified by international standards , and marked kill mind , such as "24K" marked " full red " or " gold "; 18K gold , marked the words "18K", couplers low at loK who do not play by the provisions of K gold seal number. Currently the community lawless points

Common sub- grade manufacturing fake , imitation stamp with dilute gold, Asian gold, brass and even posing as real gold , gold jewelry and thus discriminate samples according to a comprehensive judgment to determine the level of authenticity and purity .
  
There are two common methods accurately identify fineness of gold jewelry .
  
( 1 ) touchstone method : Choose delicate texture of black touchstone , with the gold standard test , ranging from gold pieces ( for gold ) draw marks on the touchstone , and then gold sample to be identified in the same touchstone scratches , drops on concentrated nitric acid to remove impurities, to find traces left on the touchstone of the

Assaying piece traces the draw contrast with jewelry samples to find the same color, the control of the sample gold standard , gold is gold to be accurately measured samples .
  
( 2 ) chemical method : point test method known as reagents . Among single -insoluble gold nitric , sulfuric and hydrochloric acid , and the silver , copper nitrate and other ingredients can be dissolved from the chemical reaction . Take gold samples. The point of nitric acid in a certain area, in the case of gold does not change color , Silver case will

Generate silver oxide and black ; case copper , generating divalent copper salt and take the green foam. More than 95% of the gold content of gold jewelry, with the point of nitric acid test , the surface changes very little .
Gold jewelry processing considerations.
If gold jewelry needs to be processed into new, large shopping malls can be selected and linked to gold jewelry tooling shop for processing ( guaranteed ) , do not get random roadside goldsmith processing. Avoid scams or Quejinshaoliang .