一克拉钻石的直径有多大?

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　　congshangmiandezuanshidaxiaoguifanbiaozhongwomenkeyikanchubiaozhunde1keladezuanshizhijingyingdadao6.5mm，danshijishangshishoudezuanshizaidaduoshuqingkuangxiazhijingzongshipianxiao，1kelazuanshizhijing6.4huo6.3mm，shenzhihaiyou6.0mmde。xiamianshiyikelazuanjiedeshangshoushiwuxiaoguotu!

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