How much is platinum in 2017? Preview of platinum price trend in 2017
4hw.org: platinum is one of the precious heavy metals. It is called the king of precious metals because it will never fade. Platinum is also used to be called platinum in our country. One is because it will never fade, but because it is rare and precious and often used as jewelry. When we buy platinum in our country, we all recognize the sign of Pt. Do you know how much is a gram of platinum in 2017? Let's take a look at it!
Price per gram of platinum in 2017
Mineralogical characteristics of natural platinum
Platinum group elements, together with gold and silver, are generally called precious metal elements in nature.
In mineral classification, PGE minerals belong to natural PGE, including iridium, rhodium, palladium and platinum. Platinum group element minerals are all equiaxed crystal systems, single crystals are rare, occasionally appear as cube or octahedral fine grains. It is generally in the form of irregular granular, dendritic, grape or massive aggregate. Color and stripe are silver white to steel gray; metallic luster, opaque. No cleavage, zigzag fracture, ductility. A good conductor of electricity and heat.
Platinum, a natural element, is a rare precious metal element in the earth's crust. The mineralogical name of natural platinum is natural platinum. It is a simple mineral of natural element platinum, and its chemical formula is PT. The specific gravity of natural platinum is 15.5-21.5, and the refractive index is 56.5-60.0.
Physical and chemical properties
Platinum group metal has beautiful color, strong ductility, melting resistance, friction resistance, corrosion resistance, and chemical stability at high temperature. Therefore, they have a wide range of uses. Among the platinum group metals, platinum is the most familiar and widely used one. It is rarer and more precious than gold and silver in precious metals.
Pure platinum is silvery white; metallic. The color and luster of platinum are natural and unchangeable. The hardness is 4-4.5 degrees. The relative density is 21.45, and the specific gravity is 15-19 or 21.4. It has strong ductility, can be drawn into a very thin platinum wire, rolled into a very thin platinum foil; its strength and toughness are also much higher than other precious metals. A gram of platinum will not break even if it is drawn into a 1.6km long filament. The melting point is 1773.5 ℃. Good thermal conductivity. Chemical properties are extremely stable, insoluble in strong acids and bases, and not oxidized in the air. Platinum does not absorb mercury, and has a unique catalytic effect.
Main types of platinum
According to the different platinum content, platinum can be generally divided into pure platinum and iridium platinum (K platinum (white K gold) is not platinum).
Pure platinum refers to the platinum with the highest platinum content or color. Its white luster is natural and will not fade. It can match any type of skin. It is twice as strong as gold. Its toughness is better than that of other precious metals.
Pure platinum is often used to make engagement rings to show the purity and permanence of love. In foreign countries, many people think that setting diamonds in gold may cause diamonds to turn yellow, thus greatly reducing the price of diamonds. The diamond inlaid with platinum can keep the pure white color of the diamond, especially for engagement ring. The diamond inlaid with platinum is white and crystal clear, which symbolizes the eternal pure love.
Iridium platinum refers to the alloy composed of iridium and platinum. Its color is also silvery white, with strong metallic luster, high hardness, high relative density and stable chemical properties. It is the best platinum alloy jewelry material.
According to the different contents of iridium and platinum, they can be generally divided into the following three types, including composition, relative density and melting point:
10% iridium platinum alloy, 21.541788 ℃
15% iridium platinum alloy, 21.591821 ℃
5% iridium platinum alloy, 21.501779 ℃.
K platinum (white K gold)
Due to the high hardness of platinum, in order to reduce the hardness properly, it is necessary to mix other metals to make alloy. In order to reduce the cost of platinum jewelry, it is often mixed with other metals to make alloy. Therefore, there is K platinum in the jewelry market. What's more, people give different meanings to K platinum.
Usually, people use the first of the following.
(1) one of the definitions of K platinum
Strictly speaking, k-platinum is not platinum with low purity; that is to say, k-platinum does not contain platinum at all. It is a misunderstanding that "K platinum is an alloy of platinum and other metals with different parts".
Due to its rare output, high price and high melting point, platinum is rarely used to produce real k-platinum in general countries. Usually, gold and palladium or nickel, silver, copper, zinc and other metals are used to smelt into a white alloy, which is called 'K platinum'. Therefore, in fact, k-platinum is a white alloy melted with gold and palladium or metals such as nickel, silver, copper and zinc. Its main ingredient is still gold. Among them, the gold content is up to 75%. When gold is melted with nickel, a white alloy is formed. In addition, silver, copper, zinc, palladium and other metals are added Therefore, more precisely, K platinum should be called white K gold. In terms of purity, rarity, durability and natural color and luster, white K-gold cannot be compared with platinum. Also, it cannot be marked with the 'Pt' flag. The gold content can only be marked with "18K", "14K" and other marks.
The calculation of k-platinum color is the same as that of K-gold, i.e. it is still calculated according to the gold content. For example, the most common 14k White Gold on the market (known as' 40K white gold 'or' 226 gold 'in the Hong Kong and Macao markets) is smelted from 58.5% gold, 22.4% silver, 14.1% copper and 5% nickel. 18K platinum (known as' 60K platinum 'or' 334 gold 'in Hong Kong and Macao market) is melted from 75% gold, 10% silver, 4-10% zinc and 5% nickel.
(2) the second statement of the meaning of K platinum
K platinum is an alloy of platinum and other metals.
When gold, nickel, silver, palladium, copper, zinc and platinum are melted together, K platinum can be made. K white gold is pure white. In 14K K K platinum, it contains 22.4% silver, 14.1% copper and 5% nickel; in 18k K platinum, it contains 10.0% silver, 5% nickel and 4-10% zinc. In Hong Kong and other markets, 40% of the K platinum is printed with 14K, also known as "226 gold"; 60% of the K platinum is printed with 18K, also known as "334 gold".