The prominent stone in this necklace is black tourmaline which is known to act as protection against negativity in many cultures over the centuries. Added to peridot, which I always associate with facilitating lovely communication, can be powerful in your interactions with others.
You may want to think of this heart as a beautiful reflection of your own heart, protected from negative energy and open to other loving hearts. As you wear this talisman it may help you remember that you are meant to connect with loving hearts that cherish you.