These are small 1-2cm pieces from Brazil.
Crystals with etchings are said to hold a vast amount of information within them.
Aquamarine is a stone of courage. Its calming energies reduce stress and quiet the mind. It promotes self-expression. It soothes fears and increases sensitivity. It sharpens intuition and opens clairvoyance. Aquamarine is also associated with water, which gives it a cooling effect on the body.