黄金首饰上的标记为何不一样?都什么意思?

　　yibanqingkuangxia，shoushishangweilenenggougenghaobiaomingcaizhi，tashangmiandouhuihuiyouyixiezifudebiaoshi，changjiandeyoug750、au990、g999dengdengbiaoshi，neime，huangjinshoushishangdebiaojiweihebuyiyang?tamendoushenmeyisini?

　　g750shishenmeyisi?zuoweizuichangjiandeshoushicaizhizhiyi，g750biaoshihuangjinhanliangwei75%dehuangjin，yejiushiwomenchangshuode18kjin，zheileishoushigenjuqitajinshudebizhongbutonghuichengxianchubutongdeyanse，secaixuanliduocai，shenshoushishangnianqingrendexiai。

　　au990shizujinshoushidesuoxie，aushijinyuansudehuaxuefuhao，au990biaoshihuangjinhanliangbudiyu990‰dehuangjin，zheileihuangjinyebeiwomenchangchengweizujin，qizhongyekeyixiezuog990、au990huojin990。

　　g999biaoshihuangjinhanliangwei999‰dehuangjin，gshihuangjinmingchenggolddesuoxie，dajiazaikandaogzidaibiaodefuhaojiukeyizhidaozheishizhidehuangjin。