s990是指含银量千分数不小于990的称足银。s990通常被用来制作各种精美银饰，并且价格方面也是比较便宜，一般一克s990银饰的价格在7元左右。 
shichangzhongchangjiandezhubaoshoushi，duoyongjin、yin、bodengguijinshudazao，qizhongyinshizui...
qiujishizhubaoxiaoshoudewangji，henduonianqingrendouxihuanqushangchangxuangouzijixiai...
zaigoumaiyinshideshihouhuifaxian，yinshidebeimianyibanyihuikeyou“...
womenzaixuangouyinshipinshi，huijingchangfaxianshangmiankeyou“s9...
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