为什么钻石的颜色等级是从D开始？

zhongsuozhouzhi，changjiandewusezuanshiyansedengjicongd-zjinxinghuafen，qizhongdweizuigaoseji，yicidijian。henduoxiaofeizheyouyigeyiwen，neijiushizuanshiyansedengjiweishenmeshicongdkaishide？erbushidiyigezimu“a”，xiamianjieshaoweishenmezuanshideyansedengjishicongdkaishi。

weishenmezuanshideyansedengjishicongzimudkaishide，erbushia？zhuyaoyouliangzhongshuofa：

一、钻石（Diamond）的首字母

dshiyingwendanci“zuanshi”diamonddediyigezimu，yincijiang“d”zuoweizuigaozuanshiyansedengji。

二、与其他评级体系区分

① zaizuanshikaicaichuqi，renmenduizuanshideyansefenjibijiaosuiyiqiehunluan。

guoqudezuanshishangyefenjizhong，cengcaiyongguozimuaaa、aa、a、b、cjishuzi0、1、2、3⋯⋯huo0、ⅰ、ⅱ、ⅲdengqufenzuanshiyanse。haiyouxiexitongzecaiqumiaoshushideziyan，ru“lanbaiblue-white”huo“youzhibaifine white”，zheixiehunluanqiebutongyideyansedengjihenbuguifan，qiejingchanghuidaozhifashengwudao。

suoyigiazhidudechuangshirenmenxiwangyouxindekaishi，buxiwangheqianshubuliangxitongjianyourenheguanlian，yinciyidzuoweizhidudeqishi。

② lingyizhongshuofashi，zhidingzuanshifenjishi，caibaodeyansefenjitixiyijingjiaoweilejie，ercaibaodeyanseshiyiａ、ｂ、ｃqufende，ａzuihao。meiyigejibiehaifenweisangexiaoji，ａ＋，ａ＋＋，ａ＋＋＋，suoyiweileyucaisebaoshideyansefenjiqubie，giadezuanshiyansefenjibiancongdsekaishi。

yeyoushuofacheng，giachuangshizhejihourenliuleyudi，dangfaxianbidsegengtougengbaidezuanshishi，keyonga、b、cse。

zaigiazhidingdezuanshi4cfenjitixizhong，“d”weizuigaozuanshiseji，jibenzairenheguojia、renyijiancejigoudoushirenkezheiyifenjitixide，xiaofeizhezaitiaoxuangaopinzhizuanshishiyikejiang“d”sezuoweishouxuan。

shoupinzhidengjideyingxiang，dsezuanshidejiazhiyepubianpiangao，touzizuanshikeshouxuandse，duiyuputongxiaofeizhe，goumaipeidaizuanshikexuanzeg-jsejibie。lingwai，zhongliang、jingdu、qiegongdengjibieyishiguanzhuzhongdian，kelianxizhuanyekefuguwenjinxinglejie。