This necklace is a reminder for you to take a deep breath and relax. Do not let a tough situation stress you out. When you feel scared, stressed, panicked or frustrated; Just Breathe.
A tip for you would be to take slow, mindful and deep breaths through the nose. Exhale for almost twice as long as it took you to take the breath. Forget about everything going on and focus on your breathing. Push all the external factors out of your mind and once you start to feel calmer, open your eyes.