'Diamond' in the Bible

I'm making you harder than flint like diamond! So you are not to fear them or be intimidated by how they look at you, since they're a rebellious group."

You used to be in Eden God's paradise! You wore precious stones for clothing: ruby, topaz, diamond, beryl, onyx, jasper, sapphire, turquoise, and carbuncle. Your settings were crafted in gold, along with your engravings. On the day of your creation they had been prepared!