“Diamonds can be shattered with a hammer”

It's a common misconception that because diamonds are the hardest natural material, they are also indestructible. This belief often stems from the conflation of "hardness" with "toughness" or "durability." People might assume that a material that can scratch almost anything else must also be impervious to breaking. This misunderstanding is perpetuated in popular culture, where diamonds are often portrayed as symbols of ultimate strength and resilience.

Scientifically, hardness refers to a material's resistance to scratching or abrasion, and diamonds excel in this property, ranking a perfect 10 on the Mohs scale. However, toughness is a different characteristic, describing a material's resistance to fracturing or shattering under impact. Diamonds, despite their exceptional hardness, possess a property known as "perfect cleavage." This means their atomic structure has planes of weakness along which the bonds between carbon atoms are relatively weaker. When a diamond experiences a sharp, forceful blow, such as from a hammer, the impact can exploit these cleavage planes, causing the diamond to split or shatter.

Therefore, while a diamond can resist being scratched by nearly any other substance, it is indeed vulnerable to being broken or cleaved by a sudden, strong impact. The popular belief that diamonds are unbreakable stems from a misunderstanding of material science, failing to differentiate between a material's ability to resist surface damage and its ability to withstand a sudden, concentrated force. This distinction is crucial in understanding why this myth, despite the diamond's reputation, is readily confirmed.