diamond

Noun

(uncountable) Diamond is a very hard mineral made from carbon that is shiny like glass.
The blades of cutting tools like saws and knives are sometimes coated in diamond.
(countable) A diamond is a precious gemstone made from the mineral diamond.
The diamond is the birthstone of April.
(countable), (geometry) In geometry, a diamond is a rhombus shape, especially one that is taller than it is wide; ◊.
- Synonyms: rhombus and lozenge
(plural) In card games, the diamonds are one of the four playing card suits.
The diamonds and the hearts are the two red-colored suits.
(countable) In cards games, a diamond is a card of the diamond suit.
I have three diamonds in my hand.

Suits

hearts ♥	diamonds ♦	spades ♠	clubs ♣