925 Sterling Silver
Sterling silver is an alloy of silver containing 92.5% by weight of silver and 7.5% by weight of
other metals, usually copper. Fine silver, is 99.9% pure silver, is relatively soft, so silver is
usually alloyed with copper to increase its hardness and strength to produce more durable
Rhodium Plated and Coating
Rhodium is very expensive metal. Rhodium plated is the best way to prevent tarnish and
discolour of jewellery. It looks brighter, shiny and increases the beauty of silver jewellery. Now,
most silver jewellery is available with coating and plating for quality of jewellery.
Reason of Tarnish or blackish of silver
The principal sterling silver alloy, 92.5% Ag-5.7% Cu, has been used for silverware and
jewellery since the 14th century. Alloying with copper strengthens silver and allows it to be used
for these items, but it has always been susceptible to tarnishing.
Tarnishing is a surface discoloration and mainly results from the formation of silver sulfide,
Ag2S. Tarnish is generally caused by a reaction of sulfur, either from the surrounding air or
perspiration that reacts with silver to form Ag2S.
Several species other than silver sulfide can also be found on tarnished surfaces. These include
sulfate, chloride, oxide, organic carbon, and oxygenated organic carbon species and a carbonate
or carbonyl present in powder, perfumes, salts and others beauty products.
Reflecting this importance, many attempts have been made over the years to develop tarnish-
resistant alloys that meet the 92.5% silver purity standard which is required if the alloy is to be
called “sterling silver.” Some of these have reached limited commercialization, but all add cost
and complicate the manufacturing process for sterling silver. The organic coating, E-coating,
polishing and alloy of silver with other metal are the major methods using to prevent jewellery.
- Avoid direct contact of sweat to jewellery.
- Remove jewellery before take bath.
- Avoid sleeping with jewellery.
- Avoid crash of jewellery.
- Avoid Chemical present in powder, perfumes, deodorant and other beauty products.
- Keep silver jewellery in glass, plastic or good material Jewellery box.
- Use soft cloth to wipe the jewellery.
- Avoid Humidity.
Benefits of wearing silver jewellery
- Silver can balance other elements in our body, so it is very important to our health.
- It keeps our blood vessels elastic and it is important for bone formation and healing, skin
formation and repair.
- Some studies show that silver rings can reduce the symptoms of arthritis.
- Silver has excellent antibiotics and sterilization effect. It has a toxic effect on some
bacteria, viruses and fungi.
- Silver can send out vessel heat quickly, so we can see that the silver has great effect on
the prevention of some diseases.
- Silver has toxicity function, which can change the colour of the silver. When silver
meets some toxic substance, it will turn into black or other colours. So you can use silver
to examine whether the substance is toxic or not.