Definition: very hard native crystalline carbon valued as a gem
Similar words: C, carbon, atomic number 6
Definition: an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds
Similar words: transparent gem
Definition: a gemstone having the property of transmitting light without serious diffusion
Synonyms: inexorable, intransigent, adamant, adamantine
Definition: impervious to pleas, persuasion, requests, reason
Usage: he is adamant in his refusal to change his mind; Cynthia was inexorable; she would have none of him- W.Churchill; an intransigent conservative opposed to every liberal tendency