Diamond

di·a·mond (d-mnd, dmnd)
n.
1. An extremely hard, highly refractive crystalline form of carbon that is usually colorless and is used as a gemstone and in abrasives, cutting tools, and other applications.
2. A piece of jewelry containing such a gemstone.
3. A figure with four equal sides forming two inner obtuse angles and two inner acute angles; a rhombus or lozenge.
4. Games
a. A red, lozenge-shaped figure on certain playing cards.
b. A playing card with this figure.
c. diamonds (used with a sing. or pl. verb) The suit of cards represented by this figure.
5. Baseball
a. An infield.
b. The whole playing field.
adj.
Of or relating to a 60th or 75th anniversary.
tr.v. di·a·mond·ed, di·a·mond·ing, di·a·monds
To adorn with or as if with diamonds.
Idiom:
diamond in the rough
One having exceptionally good qualities or the potential for greatness but lacking polish and refinement.