A Diamond Tile (or also referred to as RC Tile and white rock) is often found deep around normal Tiles, they can be found in every map, excluding Freeports. (Finch I, Finch II, (at 1/3rd the rate of Sparrow) Sparrow, and the pits) .
In the three "normal" maps, the diamonds are placed randomly in normal Tiles. They must be destroyed with, and occasionally "tunnelled" into, using Ammo. After destroying a Diamond Tile, it will randomly drop one RC Turret, Auto Turret or Burst Turret.