怎么选择钻石证书？什么钻石证书最好？

zuanshizhengshushiwomenlejiezuanshipinzhidezhongyaogongju，tongshiyeshiyingxiangzuanshijiazhideyigezhongyaofangmian。zuanshizhengshudezhongleiyouhenduo，rugiazuanshizhengshu、hrdzuanshizhengshu、igizuanshizhengshudeng，qizhong，meiguobaoshixueyuanchujudegiazuanshizhengshushiyeneirenkeduzuigaodezhengshu，xiamianfenxiangzenmexuanzezuanshizhengshu。

国外三大钻石证书：

GIA钻石证书

meiguobaoshixueyuan (gemological institute of america)，jianchenggia，shibazuanshijiandingzhengshutuiguangchengweiguojihuadechuangshizhe。giayouyushifeiyinglijigou，feichangjuyougongxinli，henshouxingyerenshiderenke。

IGI钻石证书

guojibaoshixueyuan，jianchengigi(international gemological institute)，xiangduiyugiazhengshu，igidejiancebiaozhunhuibigiabiaozhunshaodi，suoyiigizhengshudaogiasongjian，kenenghuichuxiandiaojideqingkuang。

igizhengshuduiyuqiegongxinxidemiaoshujiweijingzhun，zaifinishxiangxiahaixifenlesymmetry（duichengxing）、polish（paoguang）、proportion（bili）dengsangebufendebilimiaoshu，duizuanshidijian、yaobudengxijiemiaoshuyehendaowei。

HRD钻石证书

diamond high council--hrd（bilishizuanshigaocengyihui），jiancheng:hrd，chengliyu1973nian。

hrd antwerpzuanshishiyanshiyeshishijieshangdiyigetongguoguojibiaozhunzuzhirenzheng（iso/iec17025）dezuanshishiyanshi，qijiandingjieguohaishizhidexiaofeizhefangxinde。

hrdduiyucaisezuanshiyansedengjihetianranxingdejiandingyouweituchu。

国家钻石证书：

NGTC钻石证书

ngtc（guojiazhubaoyushizhiliangjiandujianyanzhongxin）shiguoneizuiyangedezuanshijiancezhongxin。luozuanjiancebiaozhunfeichanggao。chulechujuzuanshifenjizhengshuwai，haiduiyijingxiangqianhaodezuanshijinxingjianding。

duiyuzuanshidefenjixiangdangyange，youqishizaiyansehejingdushangbigiagengjiayange，rugiazhengshuesedezuanshi，zaiguojianshijingchanghuibeipandingweidiyijidefseshenzhigse，zaijingdufangmian，giazhengshuvvs2jibie，guojianyoushihuijiandingchengdijibiedevsji，danzongtilaishuo，guojizhengshuheguojianzhengshudougeyousuozhang

qitarugiczuanshizhengshu、ngstczuanshizhengshu、njczuanshizhengshudengyeshiguoneijiaoyoumingdezuanshijiancejigou，qijiancejieguotongyangzhidexinren，zaicibuyiyizhuishu。

duiyuguojianzhengshu，xiangyaozhidaonaxiezhengshugengkaopu，keyikanyoumeiyouxiamianzheisangebiaoshi，ruguoyou，shuomingshizhengguidezhubaojiancejigou。

举例：

怎么选择钻石证书？

· 30fenyishangzuanshishouxuangia+guojian“shuangzhengshu”

· 1kelayishangzuanshibixuyougiazhengshu

30fenyishangdezuanshikeyichujugiazhengshu，danbudebushuo，giadejiandingfeiyongbijiaogao，jishifenzuanshidejiandingfeiyongjiuyaojibaikuai，chulegaoangdejiandingfeizhiwai，yunshuchengbenyudengdaishizhangyehengao；ruguoyusuanzugou，bingqiexianggengjiaanxin，zuihaoyougialuozuanzhengshu+renyiquanweideguojianchengpinzuanjiezhengshu。

1kelayishangdezuanshijiazhijiaogao，chufeishitebiexinrendeshangjia，fouzejianyiyidingyaoyougiazhengshu。giazhengshushiguoneishichangzuiliutongdezuanshizhengshu，duiyutouzirenqunlaishuo，fudaigiazhengshudezuanshihouxugengyizhuanshou。