Corundum, the mineral forming both rubies and sapphires, is a stone believed to help balance emotions and bring inner strength. Blue sapphires like these were once carried by royal figures to help ward off harm, jealousy, and fraud from enemies. Metaphysically, sapphires are thought to assist in keeping anger and frustration at bay, making way for confidence and happiness to flourish. These deep blue pocket stones are also September's birthstone!