Yes, diamonds are considered non-renewable resources. This means that once they are mined and used, they cannot be replaced on a human timescale.
Diamonds form deep within the Earth under high-pressure, high-temperature conditions over millions to billions of years. The process of natural diamond formation is incredibly slow, and while new diamonds can theoretically be created in laboratories, the natural supply is finite.
Once natural diamonds are extracted from the Earth, they are lost as a resource. Unlike renewable resources such as timber or solar energy, which can regenerate over time, once a diamond is mined and used, it cannot be brought back. This scarcity and the length of the diamond formation process contribute to their perception as a non-renewable resource.