钻石的对称性全解

 　　zuanshideduichengxing(symmetry)shizuanshijiandingzhengshushangzuanshixiushiduxiadeyigejiandingzhibiao，shibiaoshizuanshiqiegonghaohuaidelingyigejishuzhibiao。duichengxingzaizuopingceshifenweizhuyaoduichengxingheciyaoduichengxing，bingqiedouxuyaozai10beihuozheyishangdefangdabeishudefangdajingxiaguancha。zhuyaoduichengxingquexianduizuanshiwaiguanmeiyoumingxianxianzhudeyingxiang，ciyaoduichengxingdequexianzeduizuanshiwaiguanhejiazhiyingxiangbuda。giafenjitixizhong，duichengxingfenweiexcellent、very good、good、fair、poorwugedengji，jiwomenshuodejiyou、henhao、hao、shangke、cha。

　　主要对称性缺陷

　　taimianpianxin：taimianpianxin( t/ oc)taimianbuweiyuyaoyuandezhongyang。taimianchaoshang，shixianchuizhitaimian，jiangdijiandiaodaoyaoyuandezhongxin，bijiaogouchengtaimiandelianggezhengfangxingdejiaodaoyaoweidejulishifoudengzhang，huozheguanchatingbuliangtiaoxianghuchuizhidezhuyaomianlengjiangzuchengtaimianderenyizhengfangxingshifouduidengdifenweisidengfen。ruguotaimianweiyuyaoyuandezhongyang，zezhengfangxingdesigejiaodaoyaoweidejulidengzhang，qiezuchengtaimianderenyizhengfangxingbeijunyunfenweisidengfen;ruotaimianpianliyaoyuandezhongyang，zezhengfangxingdesigejiaodaoyaoweidejulibuxiangdeng，qiezuchengtaimianderenyizhengfangxingbudengfen。

　　taimianqingxie：taimianyuyaoweibupingxing( t/ g)taimianqingxieyaoweisuozaidepingmian。zuanshicejia，shixianyingpingxingyaowei，duofangxiangguancha，yeketongguotouyingbiliyiceliangguangaobipanduan。ruguotaimianqingxie，keyicongbiliyishangzhijiekanchutouyingdetaimianyupingmushangtuandetaimianbupingxing，yekeyicongguangaobidebutongceliangzhilaipanduan。

　　dijianpianxin：dijianpianlizhongxin( c/ oc) dijianbuzaitaimianzhongxindechuixianshang。ceshizuanshi，jiaxiangyichuanguotaimianzhongxindechuixian，guanchadijianyuchuixiandezhongheguanxi;yeketouguotaimianguanchazuanshitingbudesitiaozhuyaomianlengdexiangjiaoguanxi，tuicedijianshifoupianxin。ruguodijianweiyuzhongxin，zesitiaomianlengxianghuchuizhi;ruodijianpianlizhongxin，zeqizhongdeyitiaohuoliangtiaolengxianzaidijianchubianweizhexian。

　　yaobubuyuan：zuanshiyaoweibuyuan( or) zuanshideyaoweipianlilebiaozhunyuanzhou。niezipingxingjiachizaiyuanzuandeyaolengshang，guanchashishixianyingchuizhitaimian，shidijianweiyutaimianzhongxin，zaishibeifangdajingxia，shixianchuizhidetongguotaimian，rendeyanjingduiyuandushifenmingan，nengjuechachuxiaozhi0.5%deyuandupianli，danshizaizuanshidefenjizhong，yaobudeyuandupianlizai2%yineidoushuyuzhengchangdewuchafanwei，dangyuandudadaopianli2%huogengdashi，caizuoweiduichengxingquexiankandai。

　　次要一般性缺陷(偏差)

　　( 1) bolangzhuangyaowei(wg ) youshikeyiguanchadaozuanshideyaoweishangxiaqifu，buzaiyigepingmiannei。zheizhongduichengpianchakeyiyong10 beifangdajingcongzuanshidecemianlaiguancha。

　　( 2) yuanzhuizhuangyaowei(cg)yuanzhuizhuangyaoweideduichengpianyishiyouyuzhongxinqiegeguanbutaigaohuotingbutaishendezuanshishi，weibaochiyidingdezhiliangerjiagongde。yuanzhuizhuangyaoweicongzhengmianguanchakejianzuanshideyaoweichengxianyigebaisedebutouming“huan”;congcemianguancha，zuanshideyaoweichengyuanzhuizhuang。

　　( 3) guanbuyutingbukemianxianjiebuliang( aln)ceshizuanshiyaobu，guanchaguanbuyutingbukemianzaiyaoweichudejiandianweizhuyiduiqi。zheizhongduichengpianchacongzhengmianguanchayerongyifaxian，fangfashitouguoguanbuzhukemianguanchatingbuzhukemian, kanerzhezaiyaoweidejiandianshifoujiaoyuyidian。

　　( 4) kemianjiandianbujiaoyuyidian( ptg )youzhiqiegongdezuanshi，duotiaokemianlengyingyangejiaoyuyidian。danyoushiduotiaokemianlengweinengjiaoyuyidian，ershixiangjiaozaiyitiaoxianhuoyigexiaomianshang，shikemiandejiandianxiandebugoujianrui。

　　( 5) tongzhongkemiandaxiaobudeng( fac) tongzhongkemianqidaxiao、xingzhuangchuxianbuyizhidexianxiang。

　　( 6) taimianfeizhengbabianxing( t/ oct) babianxingtaimianbianzhangbuxiangdengdexianxiang。

　　zongjieyingxiangzuanshiduichengxingyinsuruxia：yaoweibuyuan，taimianpianxin，dijianpianxin，guanjiaobujun，tingjiaobujun，taimianheyaoweibupingxing，yaobuhoudubujun，bozhuangyao，guanbuhetingbukemianjiandianbuduiqi，kemianjiandianbujian，kemianqueshi，kemianjixing，feibabianxingtaimian，ewaikemian。