Open English Wordnet
Nouns
(n)diamonda transparent piece of diamond that has been cut and polished and is valued as a precious gem (n)diamond, adamantvery hard native crystalline carbon valued as a gem (n)rhombus, rhomb, diamonda parallelogram with four equal sides; an oblique-angled equilateral parallelogram (n)diamonda playing card in the minor suit that has one or more red rhombuses on it“he led a small diamond”,
“diamonds were trumps” 