No. Diamonds can chip or break. Their exceptional hardness describes resistance to scratching, not immunity to impact damage.
The Gemological Institute of America documents chipped diamonds and explains how impacts can cause fractures along particular crystal directions. The Open University separately distinguishes hardness from toughness, the resistance of a material to breaking.
A diamond's position at the top of the Mohs hardness scale therefore does not make it indestructible. Its shape, vulnerable edges and the direction of an impact can influence damage; the claim does not become true simply because diamond is very hard.
Scratch resistance does not guarantee resistance to chipping or fracture.
Gemological Institute of America
GIA documents chipped diamonds and explains that hard impacts can cause chipping or fracture, including along cleavage planes.
Based on: Gemological Institute of America
The Open University
The course distinguishes scratch hardness from resistance to breaking and places diamond at 10 on the Mohs scale.
Based on: The Open University
Gemological Institute of America
GIA explains that a blow in the right direction can split a diamond and identifies exposed points and edges as vulnerable to chipping.
Based on: Gemological Institute of America
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