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Dictionary entry overview: What does adamant mean? â¢ ADAMANT (noun) The noun ADAMANT has 1 sense: 1. very hard native crystalline carbon valued as a gem Familiarity information: ADAMANT used as a noun is very rare. â¢ ADAMANT (adjective) The adjective ADAMANT has 1 sense: 1. impervious to pleas, persuasion, requests, reason Familiarity information: ADAMANT used as an adjective is very rare.
The luster of a diamond is described as 'adamantine', which simply means diamond-like. Reflections on a properly cut diamond's facets are undistorted, due to their flatness. The refractive index of diamond (as measured via sodium light, 589.3 nm) is 2.417. Because it is cubic in structure, diamond is also isotropic.