Suit Actions will enable players to take Diamond Crystals from the Supply, moving them to their Showroom (where they may score 1 point) or to their Vault (where they will score 2 points). Suit Actions are also taken by the winner of each trick, as well as at the end of a full Round of play. What makes the game of Diamonds different from other trick-taking card games is that when you cannot follow suit you get a 'Suit Action' based on what suit you do play.
Diamonds is a trick-taking card game in which players collect Diamonds - not cards bearing that suit, mind you, but rather actual 'Diamond Crystals' (acrylic crystals) included in the game.