Brittle]
Yes, diamonds are likely to break. It scores 10 on the Mohs Mineral Hardness scale because another diamond is the only mineral that can cut it or scratch it. But all it's hardness does nothing to it when it is subject to a counter-axial force along one of it's planes of breaking. You can break a stick-shaped diamond with your fingers, that's why they don't sell it like a stick. The form it is sold in as jewelry is cut. The cuts are all along planes of breaking. So next time, try and use your brain before telling people to use theirs.