Folding and listening to soft white, high color rendering; Hard and brittle, hard to bend and easy to break, dark in color and low in color. Pure white gold ornaments make a supporting sound when struck, without rhyme; If the color is not pure, it will make a harsh special sound, with sound and rhyme.
Chemical reagents can be tested by adding salt to nitric acid or aqua regia and waiting for a moment. If the fineness is above 95%, it will not change color. The fineness is about 90%, and the color changes slightly; When the fineness is about 70%, the color becomes dark gray.
Put the platinum ornaments on the fire, and after the fire test, the color is over 90% and will not change the original color; The fineness turns slightly black at about 70%; Fake ones will turn black and melt easily.
Platinum jewelry usually expresses the texture of jewelry with a few thousandths of platinum, which is also one of the basis for jewelry pricing. Common labels are as follows:
Platinum adequacy: the platinum content is not less than 990, and it is marked with platinum adequacy or Pt990.
950 Platinum: The platinum content is not less than 950, and it is marked with Platinum 950 or Pt950.
900 platinum: the platinum content is not less than 900, marked with platinum 900 or Pt900.
The hardness of pure platinum is small, so in order to increase the hardness, a certain proportion of precious metals such as palladium, rhodium and iridium must be added. Pt950 contains 5% palladium, rhodium and iridium, and its hardness is still relatively low, so it is generally used for plain platinum jewelry. Pt900 contains 10% palladium, rhodium and iridium, and its hardness is just suitable for inlaying ornaments. At present, most platinum ring holders are made of Pt900, but a few manufacturers use Pt950 to make ring holders.
Because metals such as palladium, rhodium and iridium are rarer and more expensive than platinum, the price of Pt900 is correspondingly higher than that of Pt950. However, many consumers have formed a habit of understanding gold in the past: the higher the purity of gold, the more valuable it is, and it is applied to the relationship between the quality and price of platinum.
Question 2: How to identify the authenticity of platinum ■ How to identify platinum and platinum?
In summer, platinum jewelry is a hot spot of jewelry consumption. Platinum and platinum are two different concepts.
Platinum is a natural white precious metal. The annual output of platinum is only one twentieth of that of gold, and it takes five months to extract one ounce of platinum from 10 ton platinum ore. Domestic platinum jewelry usually contains 90% pure platinum and is marked with Pt900. Platinum has a natural white luster and will not fade after long-term wear. The hardness of platinum makes it the best friend of diamonds. And white gold is gold with some alloys, which appears white. It only contains 75% gold at most. White gold cannot be marked with Pt mark, only gold and its purity can be marked according to its purity. For example, 18K platinum can only be stamped with 18K and G750. In the international precious metal market, the price of platinum far exceeds that of gold, which is the highest among all precious metals. In addition, some white jewelry may be made of silver or coated with white metal, which may show its original appearance after a long time. Although platinum is sometimes commonly known as platinum, it should be called platinum in a strict sense. Platinum in platinum refers to the chemical element platinum. Therefore, the purity, rarity, durability and natural white luster of platinum are incomparable to platinum.
Therefore, in fact, some jewelry marked with platinum on the market is not platinum jewelry, so it is very important to look at the internal imprint of jewelry when choosing.
■ Platinum certification
(1) visual inspection method: marking: each piece of jewelry should be engraved with the chemical composition seal, such as (pt 900) and (PT 750). All stamps that begin with "PT" are platinum ornaments: platinum is tin white, that is, white with gray and bright luster.
(2) Instrument detection: Hardness test: the hardness of platinum is 4-4.5 degrees, which is harder than gold and silver. It is scratched with a knife or glass, but it will not be scratched by nails. Density measurement: Platinum is extremely dense and feels heavy when weighed by hand. The density measured by hydrostatic method should be 2 1.43g/cm cubic fire: the melting point of platinum is as high as 1.738. Acid test when the color is unchanged: platinum is chemically stable and insoluble in ordinary acids. Draw platinum on the touchstone, drop hydrochloric acid, and try with hydrogen peroxide under the condition of unchanged wear marks: take a little platinum powder and put it into the hydrogen peroxide bottle, and hydrogen peroxide will immediately produce bubbles. After the reaction, platinum can still be used without any damage.
■ Seven characteristics of platinum
Platinum has always been regarded as a precious metal because of its unique characteristics. In recent years, the International Platinum Association has strongly advocated it, making it more and more important in the wedding ring.
Platinum was widely used in ancient Egypt 3000 years ago. Archaeologists once found that the coffin of an Egyptian priestess was decorated with hieroglyphics made of platinum, which remained perfect for a long time without losing its original luster, fully proving the durability and stability of platinum. Platinum didn't start to glow until the first diamond was dug up in Kimberly Mine in South Africa.
This year, the Italian Platinum Association launched a series of new wedding rings, and put forward seven characteristics of platinum, indicating that platinum is the best choice to become a precious metal.
1. Maximum purity.
Platinum alloy contains 95% pure platinum, and 18K gold contains 75% gold. The purity of a platinum jewelry is higher than that of gold jewelry.
2. The rarest
The world produces platinum 140 tons every year, while the annual output of gold is 3300 tons.
Only skilled craftsmen can make it. The melting point of platinum is higher than that of gold, so the technical requirements for workers are more skilled.
Step 4 be the most stable
Platinum is the metal with the strongest acid resistance, alkali resistance and high temperature resistance, and will not fade or change color. Platinum rings generally don't change.
Form.
5. Good gloss and ductility
Platinum has a natural white color, which will not affect the color of gemstones, but also make gemstones glow "fire". Its good ductility also makes it suitable for processing.
6. Do not cause allergic reaction to the wearer.
7. Valuable and excellent.
■ Common identification methods of platinum
1, color Zephyr: pure white gold is white with bright luster ... >>
Question 3: How to tell the authenticity of a platinum ring? Several methods are simple and effective. Platinum is the strongest and purest metal among metals, and of course it is also the most expensive. Every time gold or silver is scraped or polished, there is always a little loss, while platinum does not. The claws of gold and silver, which control diamonds and other precious stones, will wear away with continuous use, so more metal is needed to strengthen them, but the claws of platinum will not. Most platinum jewelry contains 90-95% pure platinum, and the rest is made of iridium or palladium. Because platinum has strong durability and durability, platinum jewelry can be used for life. Now more and more people like to buy platinum jewelry, so how can we identify the authenticity of platinum?
1. color Zephyr: pure platinum is white with bright luster, platinum is beige, and silver is white. Can be distinguished from the surface color.
2. Hand balance method: the density of platinum reaches 265,438+0.45. Through the balance test of the same volume of materials, platinum has a heavy feeling, which is heavier than gold (19.36), K- platinum and silver (10.45).
3. Melting method: The melting point of platinum reaches 1773oC, which is much higher than that of K platinum and silver. General welding guns can't melt platinum, so they can identify the authenticity. And that color of platinum doe not change after cool.
4, marking method: platinum jewelry has a standard imprint. Internationally, it is expressed by the words PT900 or PT950. For example, the purity of PT950 platinum is 950%.
5. Natural gas method: put jewelry on the twisted gas stove mouth for a few minutes. If the jewelry turns red and heats up to light the gas stove, it is platinum products. This is because platinum can be used as a catalyst to promote the oxidation and heat release of gas and air, and make platinum turn red, thus igniting the gas.
6. Spot measurement method: A Put mercury on platinum, platinum will not be polluted, and gold and silver will be polluted by combining with mercury. B. Put some powder in the hydrogen peroxide bottle with a file at the edge or middle depression of platinum jewelry. Platinum can be used as a catalyst to promote the decomposition of hydrogen peroxide and release oxygen to churn up and down.
Platinum jewelry usually expresses the texture of jewelry with a few thousandths of platinum, which is also one of the basis for jewelry pricing. Common signs are as follows: sufficient platinum: platinum content is not less than 990, sufficient platinum or Pt990 signs. 950 Platinum: The platinum content is not less than 950, and it is marked with Platinum 950 or Pt950. 900 platinum: the platinum content is not less than 900, marked with platinum 900 or Pt900. The hardness of pure platinum is small, so in order to increase the hardness, a certain proportion of precious metals such as palladium, rhodium and iridium must be added. Pt950 contains 5% palladium, rhodium and iridium, and its hardness is still relatively low, so it is generally used for plain platinum jewelry. Pt900 contains 10% palladium, rhodium and iridium, and its hardness is just suitable for inlaying ornaments. At present, most platinum ring holders are made of Pt900, but a few manufacturers use Pt950 to make ring holders. Because metals such as palladium, rhodium and iridium are rarer and more expensive than platinum, the price of Pt900 is correspondingly higher than that of Pt950. However, many consumers have formed a habit of understanding gold in the past: the higher the purity of gold, the more valuable it is, and it is applied to the relationship between the quality and price of platinum. So some merchants take advantage of this, deliberately marking the price of Pt950 higher than Pt900, misleading consumers to buy, so as to obtain income, which is bound to be suspected of fraud. Knowing how to distinguish the authenticity of platinum, you must buy it carefully in the process of buying platinum in the future, and never buy counterfeit products.
Question 4: How to tell the authenticity of platinum? 1 is stupid, just because it is too small for plat or printed with the words "platinum" or "platinum", which is platinum; If there is an "s" or "silver", it is silver.
2. The specific gravity of Beipu silver is 2 1.4, and that of silver is 10.49. Compared with the same volume of materials, the weight of platinum is almost twice that of silver.
3. The texture is very hard. And silver is white, delicate and smooth, softer than platinum.
4. After high temperature burning and cooling, the color of platinum remains unchanged, and it is still grayish white; Silver becomes moist red or black red.
5? Chemical identification method. Grinding platinum on the touchstone, dropping nitric acid and hydrochloric acid on the touchstone, and if there is a substance, it is platinum; Grind silver on the touchstone, drop a few drops of nitric acid and rinse with water. If this substance disappears, it is silver.
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Question 5: How to tell the authenticity of a platinum necklace? Identification of Platinum (1) Visual inspection method: Marking: Each piece of jewelry should be engraved with the chemical composition seal, such as (pt 900) and (PT 750). Any stamp that begins with "PT" is the color of platinum ornaments: platinum is tin white, that is, white with gray and bright luster. (2) Instrument inspection: hardness test: hardness of platinum. But it won't be scratched by nails. Density measurement: Platinum is extremely dense and feels heavy in your hand. The density measured by hydrostatic pressure method should be 265,438+0.43 g/cm. Burn it: the melting point of platinum is as high as 1.773 degrees. Burn with alcohol lamp or electric stove, and the color will not change. Acidity test: Platinum is chemically stable and insoluble in ordinary acids. Draw it on the touchstone. Test with hydrogen peroxide under the condition of unchanged wear marks: put a little platinum powder into a hydrogen peroxide bottle, and hydrogen peroxide will immediately produce bubbles. After the reaction, platinum is completely intact, and the seven characteristics of platinum can still be used ■ 1. The alloy with the highest purity of platinum contains 95% pure platinum, and 18K gold is 75% gold. The purity of a platinum jewelry is higher than that of gold jewelry. The rarest thing is that the world produces 140 tons of platinum every year, while the annual output of gold is 3300 tons. Only skilled craftsmen can make it. The melting point of platinum is higher than that of gold, so the technical requirements for workers are more skilled. 4. The most stable platinum is the metal with the strongest acid resistance, alkali resistance and high temperature resistance, and will not fade or change color. Platinum rings generally do not deform. 5. Platinum with good gloss and ductility has natural white and luster, which will not affect the color of gemstones and make them glow "fire". Good ductility also makes them suitable for processing. 6. Do not cause allergic reaction to the wearer. 7. Valuable and excellent. ■ Common identification methods of platinum 1. Color Zephyr: Pure platinum is white with bright luster, while platinum is beige and silver is white. Can be distinguished from the surface color. 2. Hand balance method: the density of platinum reaches 265,438+0.45. Through the balance test of the same volume of materials, platinum has a heavy feeling, which is heavier than gold (19.36), K- platinum and silver (10.45). 3. Melting method: The melting point of platinum reaches 1773oC, which is much higher than that of K platinum and silver. General welding guns can't melt platinum, so they can identify the authenticity. And that color of platinum doe not change after cool. 4, marking method: platinum jewelry has a standard imprint. Internationally expressed by PT or PT. For example, the purity of PT950 platinum is 950%. 5. Natural gas method: put jewelry on the twisted gas stove mouth for a few minutes. If the jewelry turns red and heats up to light the gas stove, it is platinum products. This is because platinum can be used as a catalyst to promote the oxidation and heat release of gas and air, and make platinum turn red, thus igniting the gas. 6. Spot measurement method: A Put mercury on platinum, platinum will not be polluted, and gold and silver will be polluted by combining with mercury. B. Put some powder in the hydrogen peroxide bottle with a file at the edge or middle depression of platinum jewelry. Platinum can be used as a catalyst to promote the decomposition of hydrogen peroxide and release oxygen to churn up and down. ■ Look at the mark. Platinum jewelry usually expresses the texture of jewelry by the ratio of platinum to thousands, which is also one of the basis of jewelry pricing. Common signs are as follows: sufficient platinum: platinum content is not less than 990, sufficient platinum or Pt990 signs. 950 Platinum: The platinum content is not less than 950, and it is marked with Platinum 950 or Pt950. 900 platinum: the platinum content is not less than 900, marked with platinum 900 or Pt900. The hardness of pure platinum is small, so in order to increase the hardness, a certain proportion of precious metals such as palladium, rhodium and iridium must be added. Pt950 contains 5% palladium, rhodium and iridium, and its hardness is still relatively low, so it is generally used for plain platinum jewelry. Pt900 contains 10% palladium, rhodium and iridium, and its hardness is just suitable for inlaying ornaments. At present, most platinum ring holders are made of Pt900, but a few manufacturers use Pt950 to make ring holders. Because metals such as palladium, rhodium and iridium are rarer and more expensive than platinum, the price of Pt900 is correspondingly higher than that of Pt950. However, many consumers have formed a habit of understanding gold in the past: the higher the purity of gold, the more valuable it is, and it is applied to the relationship between the quality and price of platinum. So some ... >>
Question 6: How to judge the authenticity of platinum? Ten methods to identify the authenticity and color of platinum jewelry
1) See the color test.
Generally, it is divided into three colors according to the fineness, and blue, white and gray are the true colors with higher fineness; Blue, white and yellow are platinum.
Containing gold or copper, of secondary color; Silver is platinum with more silver components, and its fineness is lower than the above.
Two kinds. Pseudoquality black.
2) Fire test
Platinum can only burn red in general fire, but can't melt. After firing, the fineness is above 95% and the color is unchanged.
And the more it burns, the brighter it gets, and 70% of the color becomes slightly black. Fake ones will turn black and melt easily.
3) Weighing and weight testing.
The specific gravity of platinum is the highest among metals, 2 1.4, which is heavier than gold 10% and other metals. It's easy to weigh it out by hand.
The color is determined, and the lighter one is either fake or the color is low. In addition, specific gravity tests, specific methods and gold identification can be used.
The specific gravity test is the same.
4) Listen to the voice test
When pure platinum is struck after fire, it will make a "Toto" sound without rhythm, while impure platinum will make a "Tintin" sound.
The sharp sound has sound and rhyme.
5) testing stubble products
Cut the ornament in half with tweezers, and a cotton (sticky) stubble appears after bending. The higher the color, the softer the stubble and color.
The second crop is sandy and brittle when cut.
6) Bend to see if it is soft or hard.
Platinum, like gold, has good ductility, and can be hammered into platinum foil with a thickness of only 0.0025 mm, and 20 sheets are so thin.
Platinum foils are stacked together, only as thick as a page. Therefore, bending hardness can also be used as a test method.
7) Try adding salt to nitric acid.
Grind platinum on the touchstone, add a small amount of salt on the platinum road (covering half of the golden road), and then add it to the salt.
Nitric acid, added to the extent that the salt is completely absorbed by nitric acid, and so on. 15 minutes, wash off salt and nitric acid with clear water. If it is platinum, 95% is.
In terms of color, the Golden Path remains unchanged, about 90%, and the Golden Path changes slightly, slightly blurring the color of about 70%, golden.
The road turned black and gray and was corroded.
8) Mercury wiping test
The scientific name of mercury is mercury, which is commonly known as mercury in China. Using gold and silver to absorb mercury, platinum does not absorb mercury (room temperature)
State) characteristics, coated with mercury in the form of gold, if it is not absorbed, it is true platinum, if it is absorbed, it is gold or
A counterfeit product made of silver.
9) Point gas lamp test
Platinum acts as a match and can be used to test the authenticity of platinum. Gas lamps are all lit with matches. If you are in a gas lamp,
Put a piece of real platinum, and after a minute or two, the platinum turns red and the gas lamp lights up. If platinum is fake, then
If it doesn't turn red, the light won't come on.
This is because platinum has the characteristics of accelerating many chemical reactions and can be used as a catalyst, oxygen in coal and air at room temperature.
It is difficult to combine directly, but with platinum catalysis, it can be combined slowly, releasing a lot of heat, making the platinum block turn red, the most
Later, the gas light came on.
10) hydrogen peroxide test
If platinum is powdery, put a little hydrogen peroxide, it is real platinum, and immediately white waves roll, decomposing a lot of oxygen, white.
There is no gold powder. If it is false, it will not change.
In the specific identification of platinum, the above methods can be used in combination, and the fineness can be determined after careful study.
Question 7: How to tell the authenticity of platinum? The annual output of platinum is only one twentieth of that of gold, and it takes five months to extract one ounce of platinum from 10 ton platinum ore. Domestic platinum jewelry usually contains 90% pure platinum and is marked with Pt900. Platinum has a natural white luster and will not fade after long-term wear. The hardness of platinum makes it the best friend of diamonds. And white gold is gold with some alloys, which appears white. It only contains 75% gold at most. White gold cannot be marked with Pt mark, only gold and its purity can be marked according to its purity. For example, 18K platinum can only be stamped with 18K and G750. In the international precious metal market, the price of platinum far exceeds that of gold, which is the highest among all precious metals. In addition, some white jewelry may be made of silver or coated with white metal, which may show its original appearance after a long time. Although platinum is sometimes commonly known as platinum, it should be called platinum in a strict sense. Platinum in platinum refers to the chemical element platinum. Therefore, the purity, rarity, durability and natural white luster of platinum are incomparable to platinum.
Therefore, in fact, some jewelry marked with platinum on the market is not platinum jewelry, so it is very important to look at the internal imprint of jewelry when choosing.
Question 8: How to tell the authenticity of a platinum necklace? Look at the luster of the color, or weigh it, and then calculate the density according to its volume, and you can see if it is platinum.
Platinum: Platinum is chemically more stable than gold and its price is higher than that of Huang Jingui. Used to make high-end jewelry. The "pt900" or "pt950" seen on jewelry products represent that the platinum content in jewelry is 90% and 95% respectively. The purity of pure platinum jewelry is generally 95%, while the purity of 18k gold is only 75%. No metal can be completely pure, and there are impurities mixed with other metals. Platinum has almost no impurities, and its purity is extremely high. It will not fade and change color, and it can still maintain its luster over time. The pure white luster of platinum can well reflect the true light of diamonds. Rare platinum is 35 times as rare as gold. In the world, it can only be mined in a few places, mainly South Africa and Russia, as well as a few areas in Zimbabwe, Canada and South America. Only 88 tons of platinum is made into ornaments every year, while 2700 tons of gold. The quantity of platinum ore is less, and the ratio of platinum ore to gold ore is 1 to 10. The density and weight of Eternal Platinum make it more durable than other jewelry metals. All precious metals leave scratches, including platinum. However, the scratches on platinum only move the metal and will not reduce its volume, while the scratches on gold will bring wear and reduce the volume of gold. If visible scratches appear on platinum, qualified jewelers can polish it again. Visual inspection: marking: each piece of jewelry should be engraved with the chemical composition seal, such as (pt 900) and (PT 750). Any stamp that begins with "PT" is platinum jewelry color: platinum is tin white, that is, white with gray and bright luster.
Question 9: How to identify the authenticity of platinum with naked eyes? Platinum is a natural white precious metal. The annual output of platinum is only one twentieth of that of gold, and it takes five months to extract one ounce of platinum from 10 ton platinum ore. Domestic platinum jewelry usually contains 90% pure platinum and is marked with Pt900. How to identify platinum 1 with naked eyes? Zephyr: Pure platinum is white with bright luster, platinum is beige and silver is white. Can be distinguished from the surface color. 2. Hand balance method: the density of platinum reaches 265,438+0.45. Through the balance test of the same volume of materials, platinum has a heavy feeling, which is heavier than gold (19.36), k platinum and silver (10.45). 3. Melting method: The melting point of platinum reaches 1773oC, which is much higher than that of K platinum and silver. General welding guns can't melt platinum, so they can identify the authenticity. And that color of platinum doe not change after cool. 4, marking method: platinum jewelry has a standard imprint. Internationally expressed by PT or PT. For example, the purity of PT950 platinum is 950%. 5. Natural gas method: put jewelry on the twisted gas stove mouth for a few minutes. If the jewelry turns red and heats up to light the gas stove, it is platinum products. This is because platinum can be used as a catalyst to promote the oxidation and heat release of gas and air, and make platinum turn red, thus igniting the gas. 6. Spot measurement method: A Put mercury on platinum, platinum will not be polluted, and gold and silver will be polluted by combining with mercury. B. Put some powder in the hydrogen peroxide bottle with a file at the edge or middle depression of platinum jewelry. Platinum can be used as a catalyst to promote the decomposition of hydrogen peroxide and release oxygen to churn up and down. Identification of authenticity of platinum (1) Visual inspection method: Marking: Each piece of jewelry should be engraved with the chemical composition seal, such as (pt 900) and (PT 750). All stamps starting with "PT" are platinum jewelry colors: platinum is tin white, that is, white with gray, and its luster is bright. (2) Instrument testing: hardness test: platinum hardness is 4-4. But it won't be scratched by nails. Density measurement: Platinum is extremely dense and feels heavy in your hand. The density measured by hydrostatic pressure method should be 265,438+0.43 g/cm. Burn it: the melting point of platinum is as high as 1.773 degrees. Burn with alcohol lamp or electric stove, and the color will not change. Acidity test: Platinum is chemically stable and insoluble in ordinary acids. Draw it on the touchstone.