GIA钻石4C标准——钻石切工好坏示意图

　　切工是钻石4Czhongdeyixiang，zuanshiqiegongdeyouyichengduzhijieyingxiangzuanshidechuhuo、shanguang，zuanshideqiegongshizhongyaodebiaozhun。shenmeyangdeqiegongzuihao?qiegongdengjiconggaodaodifenweiex(wanmei)、vg(feichanghao)g(hao)，f(yiban)，p(cha)zheiwugedengji。qiegongkexifenweiqiegebili，paoguangdu，duichengxing，zhiyouzheisanxiangtongshidadaoex(wanmei)zheiyidengjishi，caikechengweizuihaodeqiegong，jiancheng“3ex”qiegong。qiegonghaodezuanshi，nenglingzuanshichengxiangengyaoyandehuocaiyumingliangdu。

　　理想切工: 最高等级的切工。这种切工钻石的比例可以使钻石yongyouzuimeilideguangcai。zhiyou3%deyiliugaozhiliangzuanshicainengdadaodebiaozhun。zheizhongqiegongzuanshidebilikeyishizuanshiyongyouzuimeilideguangcai。 giajichulejuedinglixiangqiegongbiaozhundebiliefanweizhuomianbaifenbi(table)：52.4~57.5%，zongshendugaobaifenbi(total depth)：56.88~63.92%，yaoweibaifenbi(girdle)：0.51~2.95%，guanjiao(crown angle)：33.7~35.8，dibujiaodu(pavilion angle)：40.2~41.25，jiandi(culet)：none(pointed)~medium。

　　feichanghaoqiegong: jiejinbiaozhunqiegong。zheizhongqiegongdezuanshiyongyoujihuhebiaozhunqiegongzuanshitongyangdeliangdu，danshijiageyaodiyixie。zuijinsiyulixiangqiegong。dayue15%dezuanshifuhezheiyangdeqiegongbiaozhun。zheizhongqiegongdezuanshiyongyoujihuhelixiangqiegongzuanshitongyangdeguangcai,danshijiageyaodiyixie。

　　haoqiegong:yizhonggaozhiliangdezuanshiqiegong。zheizhongqiegongdezuanshiyongyouduocaideguangmang。jiagebifeichanghaojideqiegongdezuanshiyaodiyixie。jiagebifeichanghaojibiedeqiegongdezuanshiyaodiyixie。dayue25%dezuanshidadaozheizhongqiegongbiaozhun。

　　yibanqiegong:yizhongpinzhizuanshi，dayue35%dezuanshidadaozheizhongqiegongbiaozhun，zheizhongzuanshiqiegongbilishizuanshifachubichajiqiegongzuanshiduodeduodeguangcai。zheizhongqiegongdezuanshijiagejiaohaojiqiegongdiyixie。

　　差切工:钻石切工的最低级别.当你和其他较好等级切工的钻石相比较时，这种切工的钻石的光彩明显的少。进入钻石内部的光线大部分从边部或底部被遗漏。每一颗这种根本不满足一般切工等级比例的钻石均被列为这一个级别。我爱钻石网zheilibuxiaoshouchajiqiegongdezuanshi。

　　zuanshishenmeqiegongzuihao?henduorenxiguanyukanzhengshusuojiludeqiegongdengji，pianmianzhuiqiu3ex，renwei3exjiushizuihaodeqiegong，danruguozuanshizhijingtaidataixiaojiuhuixingcheng“heidixiaoying”he“yuyanxiaoying”，zaochengguangxianzheshebuchang，yingxiangzuanshiliangdu。zuihaodezuanshiqiegong，chuleyaoshi3ex，tadezhijingyeyaohehubiaozhun。xiamianwomenlaizuanshizhijingruhejisuande：

　　zuanshizuijiazhijingjisuangongshi：zuanshizhijingde3cifang×0.00366(zuanshidebizhongxishu)-zuanshizhongliang=±0.03(zuijiabiaozhunfanwei)

　　yiyike2.01keladezuanshiweili：

　　8.16×8.16×8.16×0.00366-2.01≈-0.02

　　jisuanjieguokezhi，cikezuanshizhenghaodebiaozhunfanweizhinei，suoyizheikezuanshiqiegongzuifeichangwanmeide。