为什么同一颗钻石在不同机构鉴定的颜色等级结果不一样

tongyikezuanshideyansejibiejiandingjieguobuyiyang，zhuyaoyoulianggeyuanyin，yishibutongjigoude“biseshi”qubie，ershi“fenjichidu”dequbie；

一、“比色石”不同

zuanshiyansepingjishijiangdaijiancedezuanshihe“biseshi”jinxingduibi，yiciquedingzuanshideyansedengji。

butongfenjitixide“biseshi”shiyouyixiechabiede：

① gia（meiguobaoshixueyuan）deshi“shangxianbiseshi”，tadezuigaosebiaoshiese，yejiushishuoruguobeicedezuanshideyansegaoyuesebiaozhunshi，jishidseji。

meiguogiadebiaozhunbiseshitushi

② guoneicaiyongdeshi“xiaxianbiseshi”，dangbeizuanshideyansedayudengyu≥mougebiseshishicainengdingweizheigeseji。

国内标准比色石图示

yishanglianggetixidebiseshizuidadequbieshi，diyilibiseshishiehaishid。

jugelizi：yikezuanshishijishangshiese，zaigiazhong，zhiyaobi“biseshi”zhongdeesegengchunjing，jiukeyipingwei“d”ji；zaiguojianzhong，zuanshixuyaodadaobiseshizhongdedcaikeyipingwei“d”ji。

二、“分级尺度”不同

guoji、guoneidengbutongshiyanshide“fenjichidu”shibutongde，zaizuanshiyansefangmian，guojianngtcduizuanshiyansedepingjigengyanke。

youqiruguomaideshi“cabian”zuanshi，jiujingchangchuxianzheizhongjiandingjieguobuyiyangdeqingkuang。

biru，zaibiseshideduibizhixia，zuanshiganggangdadaogiadegsebiaozhun，zuizhongzhengshujieguoyibanjiushi“g”se。erquguoneijiandingdeshihou，henkenengzhijiejiangzheikezuanshihuafenwei“h”se。

giasejiyuguobiaosejiduibi

guojiheguoneishiyanshidejiandingjieguozhong，zuanshiyansexiangcha1gesejisuanshibijiaozhengchangde，shenzhizuiduokeyixiangcha2～3 ji。

zaixuangouzuanshishi，“yizuanshuangzheng”nenggoujinkenengbaozhengzuanshidengjidezhunquexing，erzaiguonei，yiyoubushaoshangjiatuichuzheiyifuwu，biruzaiwoaizuanshiwang，suoshou30jiyishangdaxiaodezuanshijunkefuzenggia+guojianshuangzhengshu，shuangzhongbaozheng，gengbianyuxiaofeizhelejiezuanshidengji。