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Type of Silver :
Fine silver and Sterling Silver
Fine silver
Silver content is not less than 990 thousand points of called fine silver. Because of that too soft and difficult to minted jewelry style, but also easy to wear and oxidation black. Therefore is not suitable for making jewellery.
Sterling Silver (925 Silver)
92.5% silver + 7.5% alloy of copper is internationally recognized silver standard.
It is different with 9.999 silver, because 9.999 silver is relatively high purity , very soft and difficult to make complex and diverse jewelry, but 925 silver can.
Silver is an active metal, easy and sulfur in the air from a chemical reaction, let the silver become black. When we wear any silver jewellery as possible reduce contact with air, and is not suitable wear in chemical gas venues. If contact with sulfur soap, it must be immediately to wiped. Sweat chloride of silver also affected.
Silver and gold will not together to wear, it will make the silver turn to yellow. Of course, even if not at the same time wear, a long time ago, silver will still oxidation discoloration, whether or not plated plating!
Type of 925 Silver ：
925 Silver plating platinum
Silver is a instability metal, because of external factors lead to yellowing black,currently in the world is not any way to prevent.
925 silver plated platinum in outside (palladium, rhodium) can be effectively cut off from contact with the outside air to prevent oxidation of sulfide yellow or black. The silver not plated platinum , known as the "plain silver."
Such platinum effect is according to their protection for jewellery, generally 4-12 months can be maintained, after the effect will become back silver.
Highly polished 925 sterling silver
Newly mined silver in the time, shining beautiful white color (milk white), but once exposed to air, it will become silver gray (beige) in a very short time, when the silver in the production of a finished product, through high polishing or plating bright silver method can reproduce the silver mined in dazzling white, but the same can not be maintained in the air, about 15 days back silver color, this bright white is just selling on good-looking (such as TIFFANY series, goldfore silver series), so if the counter sales will use plastic sealed packaging.
925 Silver (Thai Silver)
To cover the silver easy discoloration characteristics, there is a method is directly silver sulfide, making it impossible to turn yellow to black, silver sulfide after the presentation of a primitive rustic effect, this approach comes from Thailand, also known as "Thai silver ", this Thai silver jewellery is usually more will use for men.
925 Silver (Sterling Silver)
92.5% silver + 7.5% alloy of copper is an internationally recognized silver standard.
generally rhodium (Rh), to prevent oxidation of sulfide yellow to black, The silver not plated platinum , known as the "plain silver."
