Aquamarine
Aquamarine is the green-blue to blue variety of the mineral beryl. (Emerald is the green to bluish green variety of the same mineral.) Its colour is usually a light pastel greenish blue Heat treatment usually gives it a more bluish appearance. Aquamarine crystals are known to be large in size and relatively clean and well-formed, making them particularly valuable to collectors of mineral specimens. Aquamarines's have a hardness of 8 on the MOH's scale of hardness.
