Gold detailed introduction

The best gold is 24K, or 18K ... I don't know how to find a professional and teach! Intersection Intersection
The platinum and platinum, is it the best? Intersection

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  1. Platinum is commonly known as platinum.

    . What is the difference between platinum and white K gold?

    The white K gold is actually a alloy that is consolidated by gold and other white alloys. Among them, the gold content is up to 75%. Or expose yellow cinematic mottled. Platinum is a natural white jewelry precious metal, and its value is much higher than white K gold. In terms of purity, rarity and durability, white K gold cannot be compared with platinum.

    The white K gold is commonly known as K platinum, and it is usually marked with "18k" or "750".

    The platinum is a natural white precious metal. Its content is marked with PT900 or PT950. Please recognize the mark when buying.

    How to identify platinum and platinum

    In summer, platinum jewelry is a hot spot in jewelry consumption. The older generation has heard platinum, but often confuses platinum and white K gold. In fact, the two are completely different.

    Platinum is a precious metal with natural white. The annual mining volume of platinum is only one -twenty of gold, and a ounce of platinum needs to be refined from 10 tons of platinum ore. Domestic platinum jewelry usually contains 90 % of pure platinum and is hit with the "PT900" logo. Platinum white gloss is naturally natural, and long -term wearing will not fade. The hardness of platinum makes it the best friend of diamonds. White K gold is gold and some alloys are white. It only contains 75 % of gold. White K gold cannot be beaten on the PT logo, and it can only be marked by the purity of gold and purity according to its purity. For example: 18K white K gold can only play "18K" and "G750". In the international precious metal market, the price of platinum is far more than gold, and the highest price among all precious metals. In addition, some white jewelry may also be silver products or white metals plated on its surface. Over time, it may show the original appearance. Although platinum is sometimes commonly known as platinum, in a strict sense, it should be called "platinum". Platinum English Platinum means chemical element platinum. Therefore, the purity, scarcity, durability, and its natural white luster of platinum are indispensable for white K gold.

    . In fact, some jewelry marked "Platinum" in the market is actually not platinum jewelry, so when choosing, it is important to look at the mark in the jewelry.

    How to identify platinum and silver

    The color of platinum and silver is relatively similar, and those who do not experience can easily confuse the two. There are five methods for identifying platinum or silver. The current division is as follows:

    comparative methods. Platinum is gray -white with flesh, with a hard texture, and a hardness of 4.3. Looking at the silver eyes, the color is white, the texture is more delicate and moist, the hardness is lower than that of platinum, and the hardness is 2.7.

    If discrimination. Because each piece of jewelry must be engraved with the printing of the ingredients, as long as you see PT, or Platinum, Plat, that is platinum; if you see S or see Silver, it is silver. In addition, pay attention to copper silver -plated symbols, it is SF.

    The weight. If the seal is blurred, or the seal has been intercepted, this method can be adopted. The density of platinum is high, the proportion is 21.4 kg / meter 3, and the proportion of silver is 10.49 kg / m 3. In this way, the same volume of silver weighs only half of platinum, and the two are easy to distinguish.

    Sometimes I encounter less materials. It feels not obvious on the weight on my hand, and at the same time there is no seal, so this method has to be used. Platinum warming or burning, after cooling, the color is unchanged; while the silver is heated or burned, and after cooling, the color will be moist, or black and red.

    chemical method. Platinum platinum on the test goldstone, and drip a few drops of mixed liquid with nitric acid and hydrochloric acid. If the grinding marks exist, it means that platinum is platinum. As for the high and low color, it is only a different color. Lost.

    The platinum identification

    If of the identification of platinum and similar metal

    platinum is silver white and strip marks, hardness 4-4.5, relative density 21.45, chemistry chemistry, chemistry, chemistry, chemistry, chemistry, chemistry Stable in nature, insoluble in ordinary acids is its identification characteristics, and it is easy to identify with similar metals.

    This compared with metal lead and aluminum, it is relatively hard and relatively difficult to deform. The latter two cannot be restored after deformation because of no elasticity; and the relative density is far smaller than platinum, the lead is 11.36, and the aluminum is 2.7, which is about 1/2 and 1/8 of the platinum. Distinguish.

    The silver and silver distinguishes with stability of relative density, hardness, and stable chemical properties. Although silver is silver -white, the relative density is 10.53, only 1/2 of platinum; and low hardness and non -elastic, so you can also leave traces with nails. The chemical properties of silver are unstable, and nitric acid will dissolve and release nitric oxide gases. Platinum is insoluble in nitric acid, and it can be dissolved quickly in the heated king water. At normal temperature, its dissolution speed is extremely slow. Generally, it is difficult to detect the naked eye.

    Platinum is a good catalyst. Using this feature, you can quickly identify platinum. The commonly used hydrogen peroxide reaction method. The specific method is: take a little measuring powder, and place it in a plastic bottle in a bilingual hydrogen peroxide (H2O2). First, it can also be recycled (it only plays accelerated decomposition); if it is other white metals, such as silver, lead, aluminum, etc., there is no such response.

    The common identification method of platinum:

    1, viewing color method: pure platinum is white, bright luster, white K gold color is white beige, silver color is the color of silver White. The surface color can be distinguished.

    2, hand oscillating method: platinum density reaches 21.45, through the test of the same volume material, platinum has a heavy feeling, it is heavier than gold (19.36), heavier than K platinum, and heavier than silver (10.45).

    3, burning method: Platinum melting point reaches 1773OC, much higher than K platinum and silver. Generally, the welding gun cannot melt the platinum, and it can be identified to the authenticity. And platinum is unchanged after cooling.

    4, tags: platinum jewelry has standard poke. Internationally use PT or PT, such as PT950 platinum color is 950%.

    5, gas natural method: Put the jewelry on the twisting gas stove, put it on a few minutes. If the jewelry becomes red and warmed up the gas stove, it is platinum products. This is because platinum can be used as a catalyst, which prompts the gas and air to oxidize the heat in the air, so that the platinum is warmed, red, and can ignite the gas.

    6, point test method: A wipes mercury on platinum, platinum will not be contaminated, while gold and silver will be contaminated with mercury. B is placed in a hydraulic bottle in the edge or middle depression of platinum jewelry in the depression of the platinum jewelry. Platinum can be used as a catalyst to promote hypoxic decomposition, and the oxygen is released up and down.

    Golden identification:
    The color disciracy contains 70 % of the golden jewelry, its jewelry is yellow, 80 % of the gold, and the gold is yellow in yellow, and the gold is 10 % red. The pure gold is soft, and it is generally not used to make embedded jewelry. Therefore, the inlaid gold jewelry claims to be 24K and is often fraud.

    This can be visible to the small quality of the gold body. You should be vigilant for the stupid and light jewelry, and carefully discern whether for fakes or semi -fakes.

    The jewelery with high rhymes, throwing on the cement floor, there will be a dull sound, sound without rhyme, no strength, commonly known as dead sound. On the contrary, the low -collision gold jewelry is thrown on the cement floor with rhymes and sharp sounds, and a slight jump.

    The testy of the soft and hard gold jewelry, the softer the soft and hard, and the more elastic. The real gold bite or the needle will have light marks. ) It will not change color afterwards. Low -colored and fake are the opposite.

    This True Gold is thrown on the desktop and the ground, and the sound of "click" is made, and fake or color differences make a sharp and crisp sound.

    This are just small gates obtained from experience. If you want to determine the authenticity of gold, it is best to go to the relevant department to do regular and firm work.

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