The slot machine features a classic 3-reel game with a single payline. The game has a multiplier feature of up to 4 times the wager and the payout percentage lies between 85 and 98 percent.ĭouble Diamond is among the simplest of slot machines designed by International Game Technologies. The simplicity of the game and the low wagering requirements of this slot make it a popular choice for many casino goers. It is a simple 3-reel slot game that is available through the developer's Double Diamond spinning reel slot machines. Initially developed for land-based casinos, Double Diamond is a slot game from the IGT labs.