diamond

a transparent piece of diamond that has been cut and polished and is valued as a precious gem

very hard native crystalline carbon valued as a gem

a parallelogram with four equal sides; an oblique-angled equilateral parallelogram

a playing card in the minor suit that has one or more red rhombuses on it; "he led a small diamond"; "diamonds were trumps"

the area of a baseball field that is enclosed by 3 bases and home plate

the baseball playing field