What is the origin of the word 'diamond'?

The word 'diamond' traces back to the ancient Greek adamao, meaning 'I tame' or 'I subdue.' The adjective adamas was applied to the hardest known substance of the time, and over centuries it became the direct root of the English word diamond. Linguists note that adamas may have originally described corundum, the mineral family that includes sapphire, before the term shifted to denote diamond specifically. That etymological link between hardness and the stone's name is fitting: diamond, whether grown in a laboratory or extracted from the earth, scores 10 on the Mohs scale, the highest rating any material can receive. Lab-grown diamonds certified by IGI carry the same chemical composition, the same carbon crystal structure, and the same hardness as any stone the ancient Greeks could have encountered. The name has always pointed to a physical property, not a geological origin.