钻石到了国检都会掉级吗？

国检钻石为什么掉级？

guojiandiaoji，zhuyaozhenduixiangqianhoudezuanshi。

zuanshixiangqianhouduizuanshijibiedepanduanhuishoudaohenduoyinsuyingxiang。

1、颜色级别

① 鉴别方式

zuanshiyansefenjiyouhenduoyangedeyaoqiu，biruzailuozuanfenjishiyidingyaotaimianxiangxiabizuanshizuixianyansedeyaolengchu。erxiangqianhaodezuanshi，taimianshixiangshangde，zheiyangzuanshibenshendehuocaijiuhuihendachengdushangyanshilezuanshidetise。

yinci，zuanshizaitaimianxiangshangdeqingkuangxia，hennanzhunquepanduanzuanshideseji，zhiyouluozuancainengzhengquedebichuyansejibie。

② xiangqianjinshuduizuanshiyansedeyingxiang

zuanshizaixiangqianhaohou，yansehuishoudaozhouweixiangqianjinshudeyanseyingxiang。ruguopeideshibaisejinshu，zuanshideyansejiuhuixianbai，erzhouweishihuangsejinshushi，zuanshiyanseyehuibeiyingchendefahuang。

suoyi，ruguozuanshizhouweixiangqiandejinshushibaisedeshihou，jiancerenyuanjiuhuiyouyishidebakandaodezuanshiyansejiangdiyixie，zheiyangjiuhuichuxiansejipanduandepiancha。

dangzuanshibenshendeyansehengaoshi，zheizhongpianchahuibijiaoda。biru“d-g”sezheidanggaosejidezuanshi，jibieyuegao，zuanshijiuyuetouming，suoyi“d”sedezuanshifeichangtouming。ruguozheileizuanshiyijingxiangqianhao，shouzuanshizhouweijinshudeyingxiang，jiufeichangnanduizuanshidetoumingdujinxingpanduan。

2、净度级别

xiangqianzuanshidejingdupanduanshiwufazhunquede。

① 观察角度有限

yinweiluozuandejingdufenjishiyaozuoguanbu、tingbu、yaobugefangmiandejiancha。erxiangqianzuanshi，zaizuojingdufenjishi，zhinengcongguanbulaiguanchazuanshi，youdenengjianchazuanshiyaobu，danyouyukuanshidexianzhi，jihuwufacongtingbujianchazuanshijingdu。

zheiyangyilai，youxiexiaciwudeweizhi、daxiaodengshinanyiguanchadaode。

② 检查盲点

zuanshixiangqianhaohou，youdebufenhuibeixiangzhuadangzhu，huoshibaoxiangkuanshi，zuanshiwaiquandouhuibeijinshubaowei，zheiyang，zaiguanchaxiangqianzuanshidejingdushi，zheixiebeijinshudangzhudedifang，shikanbudaode（bukenengbaxiangqianhaodezuanshichaixia，chedijiancha）。

GIA裸钻，在国检一定会降级吗?

bushi！zuanshidiaojizhishiyigegailvshijian。

zhideyitideshi，zaiguonei，youxiepinpaisuoshouzuanjiebujinyougiazhengshu，haifuyouguojianzhengshu。yizuanshuangzheng，gengyoubaozhang，biruwoaizuanshiwang。