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Purity of Gold in Numbers

Saturday, 12 June 2010

Purity of GoldGold values change from country to country and it happens regularly. And with more shades of gold and more gold manufacturers, we face various types of gold recently, namely white gold, Italian gold or Russian gold.

The Europeans do not appreciate Chinese and Japanese gold and the noble metal is ignored in Asia. Though, everything depends on the rate of gold, its purity.Gold is known to be the soft metal. It is easy to press, tear and cut. For the manufacture of jewelry from gold, it is melted with silver and copper to get the alloy.

There are four rating systems of gold in the world practice though the most popular are two of them: metric and in carat. The metric system is highly demanded in Russia where the concentration of the pure precious metal is shown in grams per one kilogram of alloy. So, if 1000 gram of alloy contains 585 gram of gold, it is 585th standard. And the highest standard is the 999th, though jewelry is not made from this gold. It is used in space industry only. The other standards, like 375th, 500th, 585th, 750th, 950th standards are there in the metric system. 583rd standard was used before and now this gold is not used to make jewelry also. The jewelry from the gold of this standard is antique and there is a star mark next to the number there.

The carat system is available in USA and Europe and that is provided only for gold alloys. The standard defined in carats shows the proportion of pure gold out of 24 parts of alloy. So, 18k noble metal contains the alloy of 6 parts, and in the metric system it refers to the 750th standard. By the way, 585th and 583rd standards are absent in the carat system, since 14к refers to 583,333333 gram per kilogram of alloy. Previously the number was rounded to 583, though such gold was neglected in Europe. Therefore, the government changed the rating system and made the 585th standard.

Gold from foreign countries

The Italians rarely wear the jewelry made of Italian gold, apart from holiday events, the Japanese and Chinese store the gold jewelry as the antiquities. The Russians can afford wearing golden jewelry all the time while Deutsch people prefer buying gold from Turkey for everyday wear. And again, it depends on the standards and carats.

The gold arrives as pure metal to the jewelry factory and only the manufacturers decide about the alloy and color of the output product.

Traditionally the pure yellow gold is more appreciated in Europe so some amount of copper and lots of silver are added to strengthen the gold maintaining the natural yellow color. In Italy the jewelry is made from gold of 750th standard which make them not so durable.

The quality of old in Russia is verified by heating getting the red shade of the metal. Therefore, more copper was added to the gold making the red color. When Turkey was introduced to the Russian gold, the metal was strengthened with the pure copper ignorant if the technologies, thus having the thin unique but not durable jewels of pink color. Later on Turkish jewels get to add some silver to the gold but the alloy of gold with copper is also often met in private workshops.

It is too complicated with Japan and China. They do not want any alloys and they prefer the pure metal in its purity, and thus people more appreciate the 999th standard. Such jewelry is impossible to wear for solemn occasions and everyday wear. The jewelry is to keep as family relics.

Multicolor gold

The vividness and color of the jewelry depends on the gold standard and the alloy. The yellow gold contains more silver, the red has more copper, and the white gold has more palladium and nickel. The first gives the white-snow shade and is expensive and the second is of yellowish color. When the jewelry has the bluish shade, it is coated by rhodium. The majestic black gold is received in several techniques when cobalt and chrome are added into the alloy, oxidizing the alloy at the high temperature or the jewelry is coated by the black rhodium or amorphous carbon. The brown gold fashionable recently is received from the «Russian» gold with the high percentage of copper when exposed to chemical processing. Blue (alloy with iron and chrome), green (with potassium), purple (alloy with aluminum) and light blue (with indium) gold is fragile and non-flexible and thus is used as the trimming material only.

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