GIA钻石切工等级划分标准

　　zuanshiqiegongbeichengweizuanshidiershengming，kejianqiduizuanshideyingxiangyouduoda，guojiguoneizuanshizhengshuduiqiegongdouyouzijidepingjiatixi，womenlaikankangiashiruheduizuanshiqiegongpingji，yijizuixingiaqiegongfenjibiaozhun。

　　GIA评价钻石切工：

　　giabazuanshideqiegongdoufenweinaxiejibie。giabazuanshiqiegongfenwei5gejibie，fenbiewei：excellent(wanmei)、verygood(feichanghao)、good(hao)、fair(yiban)、poor(cha)。

　　giaqiegongfenjitixi，mingliangshiyuanzuanqiegongfenjitixi，xuyaoyixiazheixiecanshu：quanshenbi，taimianbi，guanjiao，tingjiao，xingxiaomianzhangdu，xiayaomianzhangdu，yaodehoudu，yijidijiandedaxiao。fenjitixishiyongdeshujushipingjunzhi，caiyong4she5rufa。quanshenbiwucha0.1% ，taimianbidewucha1% ，guanjiaowucha0.5° ，tingjiaowucha0.2° ，tingjiaoruguoshiqishu，neimejiujinwei，liru40.7°jiangsishewuruzhi40.8°; ，xingmianzhangduwucha5% ，xiayaomianzhangduwucha5%。

　　giazuanshiqiegongfenjikaolvlezuanshidegegeshuju，dangqitayinsudouquedingdeqingkuangxia，you3gefangmianshibixukaolvde，tamenfenbieshiyaodehoudu，dijiandaxiao，yijixiushidu[paoguangheduichengxing]。ruguonixiangdedaoyigeexqiegongdepingjia，neimeyaohoubixuzaithin[bo]daostk[shaohou]zhijian。

　　GIA最新切工分级标准

　　quanqiuzuiquanweidezuanshifenjijiandingjiancejigoumeiguobaoshixueyuan(gia)，zuixintuichudeqiegongfenjizhonggongyou12gexiangmujinxingpingding。pingdingxiangmuruxia：

　　1、brightness(liangguang)

　　2、fire(huoguang)

　　3、pattern()

　　4、over weight(yulilunzhongliangdechajubaifenbi)

　　5、全深比

　　6、台宽比

　　7、星刻面比

　　8、冠角角度

　　9、冠高比

　　10、腰围

　　11、tingshenbihetingjiaojiaodu

　　12、亭部主刻面比

　　13、底尖

　　zheixiexiangmumeixiangfencheng6ji, excellent(wanmei)，verygood(henhao), good(hao), fair(yiban),poor(buhao), qiansanxiangshishiyongzuixindegiadeyiqi(diamond dock)laifenjibutongdezuanshidewaibutezheng，disixiangyeshixintianjiadeyizhongjianceshouduan，zheixiesuoyoudexiangmuzuizhongdejibiejuedinglezuanshideqiegongfenji，yuanzeshixuanzesuoyoudexiangmuzhongzuidideyijizuoweizuizhongdeqiegongfenji，yejiushiyiweizheruguoshiexcellent(wanmei)qiegongjibiede，bixusuoyouxiangmudoudadaoexcellentdejibie。