While natural formation crystals are best for feng shui and in working with plants and animals, certain man-made shapes are especially beneficial for humans, such as a sphere or an egg or a heart.  The heart shape is an excellent shape for directing energy into two strong creative directions that ultimately unite.

Meaning of heart shaped stones: 

This is one of the loveliest created shapes for a crystal. We naturally relate in a favorable way to the shape of the human organ that circulates the energy of life.  Hearts as a symbol of love started showing up around the middle of the 13th century.  Then the Japanese starting using it from 1543 to 1614 when the European merchants arrived.  Over time, it became the symbol of the heart of their goddess, Marishiten.  

A heart stone is a perfect gift for the focus of our love, be it a romance, our best friend or a child.