September birthstone necklaces feature the bright blue of its sapphire gemstone. Symbolizing good health, a September birthstone necklace will cure your style blues. Highlight the color of this regal gemstone when you surround it with diamonds or keep the focus on the brilliant blue in a perfect pendant. Choose the ever popular white gold, bold yellow, or warm rose gold. No matter which metal you choose, you’ll be happy you have your own version of the “Heart of the Ocean.”