Silver jewellery is susceptible to tarnish. If you want to brighten your pieces up I would recommend using a soft bristled toothbrush and some warm soapy water. This provides a gentle cleaning and will not affect the surface finish.
'Silver Dip' is also available in most supermarkets. This should be used by following the manufacturers instructions on the label. I would not advise using this product if the item of jewellery has any gemstones as they may be affected by the solution.
The surface texture and finishes of jewellery will alter and change with time and everyday wear. For example a matt ring will soon loose its matt texture and gain a shine. If this happens and you would like the texture restoring please get in contact as I will happily reapply the original texture. Postage charges would apply.