Diamond \di(a)-mo-nd\ as a girl's name (also used as boy's name Diamond), is pronounced DIE-mund. It is of English origin, and the meaning of Diamond is "of high value, brilliant". The gemstone first used as a given name in the 1890s. The gem is the birthstone for April. Diamond has 5 variant forms: Diamanda, Diamanta, Diamante, Diamonique and Diamontina. For more information, see also the related name Emerald. A baby name that sounds like Diamond is Demanda. View a list of the 3 names that reference Diamond.