There are five different Spin Features in Gems Bonanza, each represented by a different color on the grid. The blue markings clear out all the symbols on the grid, the pink markings turn a random symbol into a Wild Gem, the yellow markings give you 2x2 block symbols, the red markings turn random symbols into huge blocks up to 5x5 in size, and the green markings add between 5 and 15 Wilds to the screen.