Among all jewelry, 750 gold is very popular today. The gold content in the alloy is higher (75%), because it is considered more prestigious. But at the same time, the jewelry will require a careful attitude from its owner, since such an alloy is softer in comparison, for example, with items made of gold 585.
Gold jewelry has been valued at all times. It is the oldest precious metal. Unusually beautiful and valuable gold jewelry is found in the excavations of ancient pyramids and burial mounds. Due to its brilliance and color, this precious metal has always been considered the personification of the sun, which people worshiped during the pagan period. Gold jewelry identified itself with power and might. Due to the "proximity" to the pagan deity, gold was endowed with extraordinary healing properties. It was believed that this metal would help get rid of epilepsy, heart attacks, inflammation of the heart muscle and other diseases associated with the heart. Perhaps this explains the Catholic tradition - to wear a gold wedding ring on the left hand.
What is gold?
This is a highly plastic and very soft metal, which does not oxidize in air, is resistant to moisture, and is also immune to the influence of s alts, alkalis, acids. Pure gold is used in the jewelry industry for the manufacture of precious metal alloys. Gold alloy is an ideal material for jewelry production. Gold in its pure form is very soft, and its alloys are more wear-resistant and durable. To enhance the hardness of the metal, it is mixed in certain proportions with other precious and less valuable metals. The fineness of a piece of jewelry expresses the amount of gold (pure) in the alloy.
What is 750 gold?
This alloy contains 75.5% pure gold and additives, or the so-called ligature. Depending on the additives introduced into the alloy, products can be of various shades - yellow, white, green, pink, red, and even brown or black. The most popular is 750 gold. Products from it can be made the most exquisite. The alloy is easy to polish and other processing. Jewelry made of such gold is a real work of art. Earrings, bracelets, chains, wedding rings are made from it. Gold 750 has a color closer to the color of pure metal in comparison with samples below. However, by changing the composition of impurities, alloys can be obtained with the same sample, but the colorwill be different.
Karat system
In European countries, a carat system has been adopted, in which 24 carats denote completely pure 1000 gold, but it is impossible to obtain it. Therefore, gold of 999 tests (“three nines”) is considered pure. 22 carat is 917, 18 carat is 750, 14 carat is 585, 10 carat is 417, 9 carat is 375.
Composition of 750 gold
The composition of gold alloys in Europe and the countries of the former CIS is slightly different. 750 gold is usually three-component and contains silver and copper, rarely rhodium, palladium, nickel, zinc can be added. We have more copper in alloys, in Europe - silver. Due to this, our gold has a pronounced reddish tint, while European gold is more yellow. 750 gold, which has a higher copper content, is highly durable.
To increase the hardness, palladium or nickel can be added to the alloy. Palladium is a very expensive precious metal. Thanks to him, gold acquires an exquisite soft hue. The cost of jewelry with such a composition is quite high, they are suitable only for true connoisseurs of precious jewelry. The price of products with nickel is much lower, such an alloy can be magnetized.
Gold Processing
Metal steaming can be used to achieve high performance. The solid solution in this case decomposes into various phases and the AuCu3 association is released.
Gold 750 perfectly manifests itself during processing, casting, soldering links. Also, when working with vitreous enamel, the alloy can act as a base. However, it should be borne in mind that the copper content in the alloy should not exceed 16%, otherwise the quality of the enamel will deteriorate, and after a while it will lose its brightness and beauty.
Semi-precious and precious metals in the composition of the alloy
Depending on the metals included in the alloy, it can be white or non-ferrous. The appearance of the product and its technological characteristics are directly affected by the percentage of impurities of copper and silver in the alloy.
An alloy of gold and silver has a lemon hue. For an alloy of gold with copper, a pinkish or red color is characteristic. The melting point of gold with silver is a thousand degrees, with copper - a little below nine hundred. Upon cooling, a solid homogeneous mass is formed, which then decomposes into phases.
According to the chemical ratio of the elements, the 750 alloy is almost pure gold. Compared to 14k gold, this alloy lends itself much better to any treatment.
Even repeated heat treatment does not affect the strength of 750 gold alloy with copper and silver content. Spontaneous cracking of the precious metal does not occur.
Gold 750 is prestigious and noble. Jewelry made from this alloy is highly valued all over the world. Jewelry from it is always relevant and not subject to fashion trends.
