Roundstone International is not immune to the craze, introducing Double Diamond, a video slot game with shiny symbols and plenty of big wins to grab. Slot game with diamonds and other jewels all over they paytables are amongst the most common on the market, with big names such as Dazzling Diamonds by EGT or Merkur’s Diamond Casino, just to name a few. Diamonds are a girl’s and a gambler’s best friends, we all know that for a fact.