The Upside Down 福 isn't just a red diamond with an unintelligible character on it - in Chinese religion, 福 means good luck/blessing, and this object is told to give good luck. You might've noticed that the character seems upside-down - it is. This is to pour all of the good luck from the diamond into your home. Red is told to keep the bad spirits away. My family uses this diamond to express our religion, and also to get good luck.