Each stone varies. Some of the highest quality emerald crystals have been found mostly in Columbia, but gem-quality emeralds have also been found in Brazil, Russia and Africa. These beautiful, green gems have been used for inhancing love, compassion, healing and abundance. It's a great tool to use if one needs strong emotional healing in their life. 
Physically, emerald is a very strong heart chakra stone and can even help the physical heart recover from all imbalances and diseases. This stone is an overall great healing stone.