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 red, lozenge-shaped figure on certain playing cards.
5. games A playing card with this figure.
6. games the suit of cards represented by this figure.
7. baseball an infield.
8. baseball the whole playing field.
9. of or relating to a 60th or 75th anniversary.
10. to adorn with or as if with diamonds.
11. diamond in the rough one having exceptionally good qualities or the potential for greatness but lacking polish and refinement.

1. A glimmering glass-like mineral that is an allotrope of carbon in which each atom is surrounded by four others in the form of a tetrahedron.
2. A gemstone made from this mineral.
3. A ring containing a diamond.
4. A very pale blue color/colour.
5. something that resembles a diamond.
6. A rhombus, especially when oriented so that its longer axis is vertical.
7. the polyiamond made up of two triangles.
8. the entire field of play used in the game.
9. the infield of a baseball field.
10. A card of the diamonds suit.
11. made of, or containing diamond, a diamond or diamonds.
12. of, relating to, or being a sixtieth anniversary.
13. of, relating to, or being a seventy-fifth anniversary.
14. to adorn with or as if with diamonds

1. resembling a diamond; made of, or abounding in, diamonds
2. A precious stone or gem excelling in brilliancy and beautiful play of prismatic colors, and remarkable for extreme hardness.
3. A geometrical figure, consisting of four equal straight lines, and having two of the interior angles acute and two obtuse; a rhombus; a lozenge.
4. one of a suit of playing cards, stamped with the figure of a diamond.
5. A pointed projection, like a four-sided pyramid, used for ornament in lines or groups.
6. the infield; the square space, 90 feet on a side, having the bases at its angles.
7. the smallest kind of type in english printing, except that called brilliant, which is seldom seen.

1. adamant; steel, or some imaginary substance of extreme hardness or impenetrability.
2. A precious stone, distinguished from all others by being combustible and by its extreme hardness, as well as by its superior refractive and dispersive power.
3. A geometrical figure bounded by four equal straight lines forming two acute and two obtuse angles; a rhomb; a lozenge; specifically, such a figure printed in red on a playing-card.
4. A playing-card stamped with one or more red lozenge-shaped figures.
5. A tool armed with a diamond, used for cutting glass.
6. in base-ball, the square space inclosed within the four bases.
7. in heraldry, the tincture black in blazoning by means of precious stones.
8. the smallest size of printing-type in common use; a size smaller than pearl. brilliant, very rarely used, is the only regular size below it.
9. this line is printed in diamond.
10. mineral coal, as consisting, like diamonds, of carbon.
11. resembling a diamond; consisting of diamonds; set with a diamond or diamonds: as, a diamond luster; a diamond necklace; a diamond ring.
12. lozenge-shaped; rhombic: as, diamond window-panes.
13. having rhomboid figures or markings: as, the diamond rattlesnake.
14. to set or decorate with diamonds.
15.

1. the area of a baseball field that is enclosed by 3 bases and home plate
2. a playing card in the minor suit that has one or more red rhombuses on it
3. a transparent piece of diamond that has been cut and polished and is valued as a precious gem
4. the baseball playing field
5. a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
6. very hard native crystalline carbon valued as a gem