鑽石造的劍是否無堅不摧﹖

Theoretically, yes, due to diamond is the hardest usual substance on earth, but if someone is using the same sword, or someone used a flamethrower, that will be unpredictable. Due to diamond is carbon, so if flame touches it, then, it will turn to carbon slightly! But nobody has a diamond sword, due to it cost and the practical use!

一定不是,
鑽石沒有金屬的延展性, 一受撞擊會像玻璃般碎裂, 用來做兵器的話, 不可與人家的鐵甲相撞=冇用

鑽石只是堅硬，如是要做切割，要磨两個角度或以上，當鑽石有了角度，切削時力就集中有角度上，一受大的震盪就破裂。

否because the earth has cut鑽石劍

應該可以俾另一樣用鑽石做既利器整爛~
因為我聽講過, o的鑽石飾物係用鑽石刀做切割