Grand Gems (Synot Games)
Grand Gems is a diamond slot machine created by Synot Games with 5 reels, 4 rows and 20 pay lines. The only bonus option is the free re-spin (respin) after each prize combination where the winning symbols are fixed. You can activate the double or nothing minigame by betting to double the entire prize or half of the win. Learn to play free slot at CasinoGamingNews.com.