Although you can get up to 96 of them, 16 is rather a general number. The jewels with “scatter” written on them are apparently Scatters. If you locate 3 of them on 5 reels, you’ll be paid 2x of your bet. 4 of them will pay 10x, whereas 5 will pay 50x of your bet. The outcome of the game is determined by a random number generator , so it’s down to chance.