Categorised general knowledge and true and false of the gold ornaments are appraised
Categorised general knowledge and true and false of the gold ornaments are appraised
Gold ornaments
The gold is the essential valuable metal in the human life, the people of our country have had a traditional habit of wearing the gold ornaments since ancient times. The masses of consumers especially women have already regarded the gold ornaments as the indispensable adornment in daily life.
The annual sales volume of market of international jewellery is over 250 billion dollars at present. The jewellery industry of gold has got our country very since reform and opening-up
Great development, the annual sales volume reaches 80 billion yuan, and increase at the speed of 10% every year, while satisfying domestic consumption, our country is yellow
The gold jewel export is increasing constantly, exceeded 2,500 million dollars in 1997 alone, there is space greatly.
Our country is the fourth largest gold producing country of world at present, the national gold mine is up to 1200 places, 1998 produces 172 8 tons of gold per year. Since founding the state
Has already produced 2000 tons of gold totally, the gold ornaments of our country reached 203 tons with gold amount in 1999, become the third largest gold in the whole world and disappear
Fei Guo. Our country all heavy urban gold ornaments sell to some extent dropping in recent years, but platinum and diamond ornaments sale increase quickly, our country bored the decorations and consumed and reached 7 1,100 million dollars in 1999, occupied the 8th place in the world, the volume of export reached 106,400 million dollars, increase by 90% as compared to last year, occupy the second place in the world. Platinum and diamond ornaments have already accounted for 50- 70% of the ornament sales amount of big city.
1 . Classification of the gold ornaments
The ornament made of material with the gold, mainly have two big classes of pure gold ornaments and carat ornament.
Pure gold ornament, is also called the pure gold ornament. Gold does not have pure gold, the most pure gold can only be up to 99.9999%, is ” money of reagent ” specially used as the standard reagent . Sold the pure gold ornament in the ornament store, its content is 99%, 99 actually
99% Liang is planted. The former calls ” Two nine gold ” ,The latter calls ” Four nine gold ” . The pure gold texture is soft, the color and luster is helvolus, be never suffused with the color. The ornament made of pure gold is small, costly, is ideal value preserving goods and ornament. But because its texture is soft, apt to be out of shape, can’t inlay various exquisite gems, so it is difficult for the style to renovate, there are less design varieties.
The carat mean that adds metal such as a proportion of silver, copper, zinc in the gold, in order to increase its intensity and toughness. Carat (Karatgold)
“K ” It is ” Karat ” Abbreviation. The carat computing technology divides the pure gold of supreme content into 24K, the gold content of every K are 4.166% (every K is 4.15% in the early days of foundation) . The carat is 24K, 22K, 20K, 18K, 14K, 12K, 9K, the common one is 18K (75% of gold content) With 14K (58.33% of gold content) Two kinds.
2 . Differentiation of the gold ornaments
Distinguish the gold needs certain experience.
(1) See the color: The gold ornament is the taller in purity, the deeper the color and luster is. Can confirm the quality on the whole according to the following color and luster in a situation that not to the gold medal (regard blue and green gold as the criterion. The so-called blue and green gold only includes the silver composition in the gold) : Dark getting helvolus above 95% quality, shallow getting helvolus 90- 95%, it is 80-85% to be faint yellow, blue and green getting yellow 65- 70%, color blue and green to bring white light only 50- 60%, it is less than 50% that a little yellow and white. Usually said seven is blue and green, eight is yellow, nine is red and very for referencial use.
(2) Weigh weight in the hand: The specific gravity of the gold is 19.32, in weight in metal such as the silver, copper, lead, zinc, aluminium. The gold like the volume is heavier by more than 40% than the silver, 1.2 times heavier than copper, 6.1 times heavier than aluminium. Tin Box Dvd Box Wholesale Tin Containers Cd Box SupplierThe gold ornaments should have a sense of sinking and falling in hands to ask, the false gold ornaments feel light. This law does not apply to the gold ornaments which are inlaid the gem.
(3) See the hardness: The pure gold is soft, the hardness is low, can mark the simple mark with the nail, the tooth can leave the tooth to print to grip, the softness that the gold ornaments with high quality are lower than the quality, it is the harder to includes the more copper, too can roll over curved law experimental hardness, pure gold easy to roll over curved soft, purity low, it is difficult to roll over curved.
(4) Listen to the sound: Quality above 99% real gold hard to throw on the ground, will give out, rattle away, sound to have musical sound to be inelastic even. False
Or not low in quality gold voice and not senses oppressive fragile,last ” will act as ” generally The noise, and has lingering sound, fall, beat violently.
(5) Use the baked wheat cake: The ornaments that will be distinguished with the fire are heated (don’t make the ornaments melt out of shape) ,Cool, observe the color to change, such as the gold color and luster is the pure gold that the surface is still in fact presented; If the color changes and darkens darkly and in various degree, it is not the pure gold. The lower the general quality is, the denser the color is, all darkens, prove it is the false gold ornaments.
(6) See marks: Domestic gold ornaments all purify formulating according to international standards, type stamps, such as ” 24K ” Indicate
” pure gold ” Or ” pure gold ” ; 18K money, indicate ” 18K ” Words; Quality person of 10K lower thanned, can fight K golden seal No. according to regulation. The lawless person makes false trade mark, models stamps dailily in the society at present, use rare gold, inferior gold, even the brass is passed off as real gold,
Distinguish gold ornaments want, go on, judge, come on, confirm true and false and quality high or low prices synthetically according to the sample.
There are two kinds of accurate differentiation commonsense methods of the ornaments quality of gold
(1) Touchstone law: The black touchstone choosing the texture to be fine and smooth, try the gold one with the standard of the gold content (to the gold medal) Mark the trace, the scratch on the same touchstone of gold jewellery sample that will and then appraise on the touchstone, drip dense nitric acid and remove the impurity, try gold one scene of trace contrasts in trace and what has been rowed found out and stayed on the touchstone, find out the colour like ornaments sample,
Contrast standard degree of the money of sample, will examine the accurate gold content of decorations samples of deposits.
(2) Chemical law: Also called reagent and clicked the law of trying. The gold is not dissolved in single nitric acid, sulfuric acid and hydrochloric acid, but compositions such as silver, copper,etc.
Chemical reaction and quilt can arise with nitric acid to dissolve. Fetch the gold jewellery sample. Click nitric acid in a certain position, if the gold will not change color
,If is the silver products, will produce and oxidize silver and darken; If is the copper products, turn into the two prices copper salt and emit the green foam. Above 95% gold ornaments to gold content, click and try with nitric acid, the surface is changed very small.
3 gold filled, gilding and imitating the gold ornaments
Jin Bao one thin goldleaf that make in ornaments, roll, pigeonhole in blank surface with mechanical method, its inside is copper, silver, nickel, copper zinc alloy,etc., the thickness covered with gold leaf is generally about 10- 50¦Ì m.Electronics Manufacturer| Electronics Manufacturing China| China Electronics Manufacturers Observe in ornaments wrapping up layer have one obvious interface, can think with 10 times of magnifying glasses very much obviously carefully.
Gold-plated ornaments in purpose-built to plate in the trough, a layer of thin goldleaves at electroplating the blank. Must be indicated and gilded one layer of thickness according to the gold-plated ornaments of regulation. If Pª 4Aª U shows that it is 4¦Ì m to gild one layer of thickness. Electronics Contract Manufacturing| Electronic Contract Manufacturing ServicesGild layer easy to grind off, very informal factory multi-purpose to plate ink King or plate sour
The gold method is made, a layer of thin gold on plating the surface of blank, because the gold particle cohesion is not strong, extremely easy to corrode, will change color soon, some will change color once entrying into water.
Imitated the gold ornaments and is also called the inferior gold ornaments, appearance is golden yellow, mixed and smelted by metallic elements such as the copper, nickel, zinc,etc., not in the ornaments
Includes the gold composition, do not allow to print and write according to the imitative gold ornaments of regulation. Electronic Manufacturing| Electronic Manufacturing Services| China Electronic Manufacturer| |Consumers can distinguish each other with very gold ornaments since feeling, on the harmonious sounds, weight and hardness.