Review for Diamond Jim's Casino Review For Diamond Jim's Casino Google User Oct 9 '18 at 20:17 This is a true Casino in Rosamond California about 10 minutes from Lancaster California. Guess what it has a wonderful restaurant!! A wonderful bar and great management. Since it's a casino it's open late hardly closes and has great security and safety for any long trip stop by there you won't regret it. View full site to comment or like