This is one of the most stunning watermelon tourmalines I have ever seen...there is a vibrant magnificent rainbow running through it (hard to caputre in the photo). This is such a unique and amazing piece.
Watermelon tourmaline is said to link the emotions of the pink center to the physical being of the outer green rock, bringing joy to a person's life and relationships. Green tourmaline is the yang to the yin of pink tourmaline.
Diamond, in its rarity and beauty, is indicative of the loving and open nature with which one came into the physical realm, and encourages the aspect of truth and trust. 
Chain length: small rolo chain is 18 inches long