A sparkling sapphire crystal features on this dainty necklace, and we think this makes the perfect gift for a September birthday! The 4mm crystal is placed into a traditional claw setting which means there is no risk of the stone coming loose or falling out. The diamond cut curb chain is 16 inches with a 2 inch extender and is 0.6mm thick, so it's a fine and elegant chain. The necklace weighs 1g overall and is stamped with 925 for sterling silver.