钻石为什么不都切割成3EX切工？

3exzuanshiqiegongyechengwanmeiqiegong，zhizuanshidecutbili、polishpaoguang、symmetryduichengjundadaoex lixiang（excellent）jibie，zuanshiqiegongyouqiemozhongxinbakong，neimeweishenmeqiemoshimenjiangzuanshidouqiecheng3exjibie？

zuanshidejiazhiyouzuanshi4czonghejueding，qizhongzuanshizhongliangduizuanshijiazhideyingxiangzuida。zaitongdengpinzhixia，dangzuanshichaoguotedingdaxiao，keyitigaoyigebaojiaqujian。suoyijuedabufenzuanshibeiqiegeshi，huijinkenengdebaoliuqizhongliang，bingjinkenengbusunshiqishanliangchengdu。

shouxianlejieyixiazuanshideqiemoqingkuang。

zaiqiemozuanshishi，you2zhongchangjiandeshouduan：baoliuzhonglianghuoxishengzhongliang。

1、保留重量

biruyikezuanshiyuanshixiangyaodadaowanmeiqiegong，neimeyujiqiegehoudezhongliangshi0.39ct、0.49ct、0.69ct、0.99ct，zairapaportguojizuanshibaojiabiaozhong，zheixieweiyuzhengfenshulinjiediandezuanshi，zhixuzengjia0.01ctjiunengdadaolingyijiagequjian。

duiyuzheizhongbudebuyousuoqushedeqingkuang，youshihouchangshanghuixishengzuanshideqiegong，congerbaoliuzuanshizhongliang，rangzuanshinenggoudadao0.40ct、0.50ct、1.00ctdengdaxiao，zheiyangzuanshikeyiyougenggaodeshoujia。ruciyilaizuanshideqiegongyejiudabudaoexqiegong。

2、牺牲重量

baoliuzhongliangdezuofashixishengqiegong，daozhimeiyou3exqiegong。erlingyizhongxiangfandezuofajiushixishengzhongliang，baozhengzuanshiqiegong，lingzuanshichengxiangenghaodeliangduhehuocai。yi0.40ctweili，ruguoqiegongyaodadao3ex，kenengzhongliangzhishengxia0.38ct。

suoyi，zuanshibuqiegecheng3exqiegong，hendakenengshiweilebaozhengqizhongliang。yeyoubufenyuanyinshiweilebikaiyixiexiaci，biruzuanshiyuanshineibuyoumougebijiaomingxiandexiaci，xiangbikaizheigexiaci，henkenengjiuyaoxishengdiaozuanshiqiegong。

huanyanzhi，fei3exqiegongyeweixiaofeizhetigonglegengduoxuanze。xiaofeizhezaixuangouzuanshishi，jianyiyi3exqiegongweizhu，danzaiyusuanyouxiandeqingkuangxia，vgqiegongyeshikeyijieshoude。