Black Tourmaline, known as one of the premier crystals for protection, it helps to put an energetic boundary between you and others. Is associated with the root or base chakra, and is excellent for grounding excess energy. 

It is a well-known as a purifying stone that deflects and transforms negative energy, and thus is very protective. The Black Tourmaline uses connect to all chakras to lend protection and draw out energetic impurities. 

If your emotions are tainted by irrational thoughts, recenter yourself with positivity. It can transform and remove negativity from an individual or an environment. It is often used as an aura cleanser, and can help one attain higher levels of awareness. Black Tourmaline is excellent for dispelling fears, obsessions, and neuroses, bringing stability. 

It encourages positive attitudes, good luck and happiness, regardless of the circumstances that you find yourself in.

Please note that I personally chisel hand wrap each necklace and each stone will vary slightly in size.