I really enjoy Aquamarines. Maybe it has something to do with the color being similar to clear ocean water.
I didn't notice it at first, but this one is joined laterally to another half crystal. Most of the aquamarines I have seen are hexagonal. This one has 6 sides, plus 3 more. I don't know how rare this is, but it makes this piece much thicker.
The crystal is actually twice as long as what is seen here, but it is partially hidden by matrix. The matrix is Muscovite and some other soft white rock.
This piece comes from Pakistan.