What woman would refuse to receive a gift of a gold ring or a silver bracelet? That's just the quality and therefore the value of the jewelry will depend on exactly how much precious metal is contained in the alloy from which it is made. The content of silver or gold in the product let you know jewelry samples.
It is clear that of pure gold or silver jewelry is not manufactured in pure form, precious metals are very soft, and the cost of such products will be very high. Therefore, for the manufacture of jewelry, using alloys in which the precious metal mixed with other noble or plain (Nickel, copper, zinc) metals. Jewelry samples allow you to know exactly how much precious metal contains a particular alloy.
Breakdown call not only the content of alloy, but the mark with the appropriate symbol, which is marked with the product. According to Russian legislation, all alloys that contain more than 30% noble metal (by weight) should have a stigma indicating a sample. But you need to consider that in different countries jewelry tests are labeled differently.
So, in Russia and the CIS countries adopted the metric system. Jewellery samples show how many thousandths of a noble metal contains one part alloy (the number of milligrams to gram, gram to kilogram, etc.). For gold there are five jewelry samples: 375, 500, 585, 750, 958. Sometimes 583 and 996 samples are isolated. 999 test is pure gold.
The color of gold depends on the content in the alloy impurities of other metals, particularly copper and silver. Most often, to make jewelry using gold 585. For filigree work is more suitable gold 750. Gold 958 sample is rarely used because it is soft, does not have a very rich color and holds a Polish. All gold alloys above 750 on the air, do not fade .
Taken jewelry samples silver — 750, 800, 875, 916, 925, 960, 999. For platinum installed one sample — 950, palladium - two, 500 and 850. However, palladium is not used for making jewelry, so the probability of collision with it is not high.
Outside the CIS are used carat jewelry samples. The unit of assessment of the purity of the metal in this case is a British case. Thus, carat alloy shows how many carat precious metal contains 24 carats of alloy. Carat sample is denoted by the capital letter K. to calculate K the sample is in metric, just divide the Karat value of the sample 24 and multiply the result by 1000.
The ratio of K and the metric trial of gold next :
- 375 test - 9 carats
- 500 sample — 12 CT
- 585 — 14 Karat
- 750 — 18 carat
- 958 test - 23 carats
- 999 (pure gold) is 24 carats
Before began to use modern jewelry carat (metric carat), operating in Russia spool test, and in Western Europe — lot.
As we have already said,in jewelry you must put a stamp with the symbol sample. On products made in the CIS, the sample will be marked in the metric system, on all others - in the carat. Sometimes you can find a brand like 23KGP. This means that the product is gilded, it is covered with 23-carat gold (958 gold). On Russian gilded products, the sample is not put.
On jewelry, made in Russia, except for the stigma samples (which puts the Chamber assay supervision) shall bear the manufacturing stamp is the stamp of the master or of the firm. The names consist of four characters. The first is the code of release (letter A corresponds to 2001, B — 2002, etc.), the second — code inspection of assay supervision, the remaining code of the manufacturer.
Genuine product the list of names should stand only at the top or left of the sample. and both stamps should be clearly printed. All symbols of the nameplate must be enclosed in a single contour. On items from abroad, the nameplate may not be, it's normal. The sample, of course, on such a product will be carat.
If you want to buy a really quality piece of jewelry, it is important to know what are jewelry samples and stigma - this will help you avoid mistakes.