钻石各部位名称详解及最佳标准

       yibanxiaofeizhezaigoumaizuanshishizhuyaoguanzhuzuanshi4cjibie，erxiangyaogengshenrudelejiezuanshi，jiuyaozhidaozuanshigegebuweidejiegoudengxiangguanxinxi，xiamianxiaobianjiudaidajiagongtonglejieyixiazuanshigebuweimingchengxiangjie。

       zuanshizhijing：celiangyanyaoweiwaihuanxianliangxiangduidianzhijianjuli。

       zuixiaohezuidazhijingshiyouxuduocishuzhijingceliangsuojueding。zheishiyinweizuanshibuyidingshizhengyuanxing，suoyizhijingzuidayuzuixiaodechajuyuxiaodaibiaozuanshiyuyuan，zuihaodeshizhijingzuidayuzuixiaodechaju0 。zhijingjiliangdaozuijiejinbaifenzhiyihaomi（0.01haomi）。pingjunzhijingshiyongyujisuantedingbilvdeyiju，jihuguanxidaoqiegebilibaifenbidoushiyizhijingzuojizhun，rutaimiandedaxiaobili，zongshendubili，guanbugaodubili，tingbushendubili。

       pingjunzhijing=（zuixiaozhijing+zuidazhijing）÷ 2

       zhuomian( table )：guanbubabianxingkemian。

       zhuomiandekuandu：zhuomianshangfengzhengdiandaoduimianfengzhengmiandianjianjuli，quzhizuijinde0.5mmweishu(jibaifenweiwei5huo0 )，shiyong4geceliangpingjunzhi。

       zhuomianbaifenbi=（pingjunzhuomiankuandu÷pingjunyaoweizhijing）×; 100

       quanbushendu：zuanshizhuomianzhidijianzhijiandechuizhijuli。

       quanbushendubaifenbi( total depth percentage ) ：quanbushenduxiangduiyupingjunzhijingbingjisuanzhizuijiejindeshifenzhiyibaifendian（0.1 ％）。

       quanbushendubaifenbi=（shendu÷pingjunyaoweizhijing）× 100

       guanjiao：naifengzhengkemianyuyaoweipingmianshangyuandejiajiao，keyingxiangzuanshidemeiguan。

       yibaneryan，rudapeiqiadangdezhuomianbaifenbihedijiao， 25°dao35°fanweineideguanjiaohuixingchengmingliangyouyouhuoguangdemirenzuanshi。keyoucemianhuozhengmianlaigujiguanbudejiaodu。

       guangao( crown height ):yaoweipingmianzhizhuomianshuipingmianjiandejuli。

       guangaobaifenbi( crown height percentage ): guanbugaoduxiangduiyupingjunzhijingdebaifenbi，jisuanzhizuijiejindebangebaifendian（0.5 ％）。

       guanbugaodubaifenbi=（guanbugaodu÷pingjunzhijing）×100

       dibuzhukemianyuyaoweishuipingmiandejiajiao= dibuzhukemianyuzhuomianshuipingmiandejiajiao。

     ;  suoyou8gedibujiaodudepingjunzhiqiejisuanzhizuijiejinshu0.2 °（liru，41.2 °，41.6 °）。

       yaobupingmianzhidijiandejuli。

       pingjundibushenduxiangduiyupingjunzhijing，jisuanzhizuijiejindebangebaifendian（0.5 ％）。

       dibushendubaifenbi：pingjundibushenduxiangduiyupingjunzhijingdebaifenbi

       dibushendubaifenbi=（pingjundibushendu÷ pingjunzhijing）× 100

       yaobuhoudubaifenbi：gaiyaobuhouduzuibodaozuihoudefanweidiqu。 

       giadezuanshifenjibaogaoshuliechumiaoshubaokuo： chaobo( extremely thin)、henbo（very thin）、bo（thin）shizhong（ medium）、weihou（ slightly thick）、hou（ thick）、henhou（very thick） 、chaohou（ extremely thick）、yaobuhoudubaifenbi( girdle thickness percentage )  ：yaobuhouduxiangduiyupingjunzhijingdebaifenbiyaobuhoudubaifenbi=（yaobuhoudu÷ pingjunzhijing）× 100

       dijian（culet ） ：dibuzhukemiandejiaohuidian，chengdianzhuanghuochengxiaobabianxingkemian。dijiandaxiao( culet size ) ：dijiandaxiaoshixiangduiyupingjunzhijingdepingjunshuiping。giadezuanshifenjibaogaoshuliechumiaoshubaokuo  wu（ none ）、chaoxiao( extremely small )、feichangxiao( very small )、xiao( small )、shizhong( medium )、shaoda( slightly large )、da( large ) 、feichangda( very large )、chaoda( extremely large )、wu（ none）meiyoudijianmian，youshiyebeichengweijiandijian。

       youzhuomianbianyuanxiangyaoweiyanshendekemian。xingkemianzhangdubaifenbi( star facet length percentage ) ：congxingkemiandaotaimianbianyuanjuli，xiangduiyutaimiandebianyuandaoyaobubianyuanzhijiandejuli。zheishipingjunsuoyou8xingkemianbingjisuanzhizuijiejindebangebaifendian（0.5 ％）     xingkemianzhangdubaifenbi= ( a ÷ b ) x 100 ％

       xiayaomian：yaoyutingbuzhukemianzhijiandesisanjiaoxingkemian。

       xiayaomianbaifenbi( lower girdle facet percentage ) ： lianggetingbuzhukemianxianghuidediandaozuijiejinyaobudeshuipingjuli，xiangduiyuyaobubianyuandaodijianzhongxindeshuipingjuli。suoyou8gexiayaomiandepingjunzhiqiejisuanzhizuijiejindebangebaifendian（0.5 ％）。

   ;    xiayaomianbaifenbi= ( a ÷ b ) x 100 ％