| Developer: | Kaiko |
| Publisher: | Demonware |
| Released: | Commodore 64 |
| Genre: | Puzzle |
| Composer: | Chris Huelsbeck |
| Platforms: | Amiga, Atari ST, Commodore 64 |
Gem'X was a 1991 puzzle game for the Amiga, Commodore 64 and Atari ST platforms from game developer Kaiko GmbH. The player is presented with two rectangular grids of coloured gems, the left grid is changeable and the right grid is static. The aim is to click on gems on the left grid to make it look exactly like the right grid. The challenge comes from the fact that clicking on a gem to change its colour also causes the four adjacent gems to change colour.
Gem'X originally caused special interest because of the various anime-style beautiful young women shown between levels, in very skimpy clothing, although their intimate parts aren't shown until the final picture for completing the game.
The game music was written by Chris Huelsbeck.
Gem'X received generally positive reception from video game critics.