Silver and gold are made in a way that is less true in the mixing process will be easy to dull levels, changing color to black sometimes.
Cause easily dent or scratch could be due to the high levels of silver or gold that is rather soft. Being dull or black and silver or gold content otherwise may be low, so easy oxidation or react with other substances. Usually the cause is the harshest of salt and sulfur, this means sea water and may bathe in natural hot springs that contain sulfur. Or the more common is a mixture of materials that surfaced. It's kind of natural law which would light up the stairs. This happened just as solid but a bit long. Usually if you ever cut a gold ring to be diminished in size it will be visible cut line. This is the stained surface. seems that in fact it is the color stained.
How to treat the right:
Wipe frequently your silver and gold jewelry. Use a cloth and abrasive materials such as autosol are sold in supermarkets or often at a motorcycle repair shop. Wipe using a soft and nice of the former cotton shirt or cotton that has been frequently washed. Cotton, but scrubbing can also be rather difficult.
Store in cloth bags before entering the cabinet, or leather bag. If there is silica gel which is easily available in supermarkets are also very good. Another safe place is a box of paper, plastic and metal.
Opaque gems. Actually opaque gems can also be rubbed with the above, but take longer depending on the level and type of gem buramnya. If diamonds do not try because this jewel of the toughest in the world. Very special, so expensive. Actual ways of smoothing the gem with metal goods ie the process of polishing or sandpaper and rub like the above.
Gold or silver if you have too scratch and you do not mind a little shrinkage (same, goldsmith was serviced to shrinkage) use fine sandpaper to be an occasional dip in the water. If thats enough to use just fine autosol cling again had to make. If not cling amplasan means less. This is called polishing. This method can not be done for plated items due to lead plating layer is lost.
