This obsidian combo will keep you calm, grounded and protected from any negative energy directed towards you and from the energy around your environment.
Obsidian blocks psychic attack (brujeria), it enhances your intuition abilities and it protects you from EMF (electromagnetic frequency) waves.
Keep that sense of security with you, especially if you're an empath as you absorb feelings and emotions unvoluntarily. 
Your energy is worth protecting.
Because obsidian does absord energy, it is recommended that you cleanse it ocasionally depending on how often yuou wear it.
This is an adjustabnle choker that can be wore in different ways, get creative ;)