We recommend that you play the fully featured demo of Double Diamond right here so that you can familiarize yourself with the features. This is also a diamond themed slot game although you won’t actually see any diamond symbols in it. There is no registration and no download required. To play for free just use the demo game in your browser here at. It continues to be popular with a lot of players who love its simplicity. The Double Diamond game from IGT is a true classic slot that has been around for quite some time now.