Gem Tower Defence, as in the original Flash game, features eight basic gems, all of which are available in six tiers. This page presents the specification of each gem.
The gems' graphics are shown in PNG format in the tables below; be aware that the game uses scalable (SVG) versions of these images.
Note 1: Range is counted in grid tiles. One tile equals 13 px of the original game's count.
Note 2: Cooldown is counted in game ticks. The game is set to run at 40 ticks per second, therefore 1 tick = 25 ms.