Diamond

The diamond is an item in Plants vs. Zombies and Plants vs. Zombies 2: It's About Time worth $1000, the highest value of any currency item. Since it is very valuable, it is very rare.

Plants vs. Zombies

 * Rarely dropped after killing a zombie
 * Kill a Zombie Yeti. (four, five if first time) (using I, Zombie Hack can summon many Zombie Yetis to get diamonds)
 * Grow a Marigold to full size. (one)
 * Grow a normal plant to full size. (two)
 * First time complete Mini-games, Survivals or Puzzles. (one)
 * Find Bacon on 3-4 or 5-4. (one, depends on version)
 * Find Crazy Dave's Magic Taco on 4-4. (one)​
 * Every three streaks in I, Zombie Endless or every ten streaks in Vasebreaker Endless. (one, not always)
 * Defeat Dr. Zomboss in Adventure Mode. (three)

Plants vs. Zombies 2: It's About Time

 * Open a lunchbox. (From one to three)
 * Rarely dropped after killing a zombie.

Lucky Spin Achievement
Lucky Spin is an achievement that is earned when the player rolls three diamonds in Slot Machine. It is arguably the hardest achievement in the game because one diamond is very rare, and three is even rarer. In console versions, however, they just have to get a diamond. It won't give them anything, but two diamonds will give the player one. The PS Vita version, however, does not involve diamonds to get the achievement; instead, three of a kind in general will get it.

Trivia

 * Diamonds have a "gleam" when they are about to be picked up. A chiming noise also is played when they appear.
 * The "gleam" is removed in Plants vs. Zombies 2: It's About Time, however, the chiming noise is still present.
 * The Diamond resembles the blue gem from Bejeweled, one of PopCap's other games.
 * They also make the same noise as in Insaniquarium when picked up.
 * The diamond appears in the PC icons of Beghouled and Beghouled Twist.