1, 925 silver refers to silver products with a silver content of not less than 92.5%, and the purity above this is regarded as pure silver. Because high-purity silver is soft and easy to oxidize, 7.5% other metals are added to 925 silver, which makes it have ideal hardness and can be better shaped, inlaid with various gems and made into various silver products.

2.999 The sufficient silver in silver ornaments can be called pure silver. The content is the number behind the metal symbol, and 999 silver is 99.9% silver.

3. Millipede silver refers to silver with a silver content of 99.9%. The silver content used to make thousands of silver jewelry should not be less than 99.9%, which is also the highest purity standard of silver products stipulated in the current national standard "Provisions and Naming Methods of Precious Metals in Jewelry".

4. Foot silver It is said that the silver content is not less than 990. Generally processed into bracelets, pendants, longevity locks and other silver ornaments, foot silver ornaments usually have several signs, one is S99 and the other is S990, and S is the initials of the English word Silver, which stands for silver. There are 999,990,925 contents.

5. Pure silver is metallic silver, and its content is close to 100%. However, because silver is an active metal, it is easy to react with sulfur in the air to generate silver sulfide, which turns it black, so "pure silver" in life generally refers to silver with a content of 99.99% or 925 pure silver with a content of 92.5%.

Silver purity identification method:

? 1, imprint

Silver ornaments are generally stamped with the English abbreviation of silver ("S" or "Sterling"). The mark of standard silver is S925, and the mark of foot silver is S990, but many countries do not print notes on silver ornaments.

Step 2 color

Silver ornaments are mostly yellowish silvery white with a soft metallic luster. Due to easy oxidation, the color will turn dark yellow and white after a long time.

Step 3 consider

The density of silver is10.53g/cm3. Smaller than platinum and gold, it won't fall off by hand. Steel needles can be marked or bent. In this way, it can be distinguished from German platinum, K gold or imitation silver jewelry.

4. A severe test

Silver will change color or even dissolve when it meets any acid. If a drop of concentrated hydrochloric acid is dropped on the inside of silver jewelry, white moss-like silver chloride precipitate will be formed immediately. Other precious metals do not have this phenomenon.

5. rhythm

Standard silver jewelry has a dull sound after landing, and does not rebound or roll.