Brittleness: the property that a material undergoes only minor deformation under the action of external forces (tension, impact, etc.). ), it is broken and broken.
Knocking with a hammer is to impact the diamond and test its brittleness.
Although diamond is the hardest substance in nature, it is very brittle.
Most single crystal gem minerals have great hardness to cope with the wear and tear of daily wear. At the same time, it is often fragile, so most jewelry stores have carpets to prevent gems from falling and breaking.
On the other hand, diamond has octahedral cleavage. If the force is applied in the right direction, it can crack along the cleavage plane with little force. In fact, this is a traditional diamond cutting method.
So diamonds can't be smashed, they will be broken; You can't knock, it will break. But if you dress well, it can last forever. (High hardness and wear resistance, excellent chemical stability)