Common definitions of Diamond include:
An extremely hard, usually colorless mineral made of carbon.
Brilliant gemstone that is the birthstone for the month of April. Quality and value are generally based on the "4 Cs" system: color, clarity, cut and carat weight.
Term referring to the infield in baseball. The paths connecting first, second, third and home base make up the "diamond." Sometimes refers to the entire playing field.
Colloquial name of rhombus, a shape with four equal sides and no right angles. Also referred to as a lozenge.
One of four suits in traditional playing cards. The other suits are spades, hearts and clubs.
Neil Diamond. Pop star famous for 1960’s and 1970’s hits such as Sweet Caroline, Heartlight, America and You Don't Bring Me Flowers.
Related Diamond resources
About.com Geology Diamond the Mineral [1] About.com Jewelry/Accessories Diamonds [2] About.com Oldies Music Neil Diamond [3] About.com Poker Origins of the Four Suits [4] How Stuff Works Baseball Diamond [5] Online Etymology Dictionary [6]