T1909 Beryl var. Aquamarine
I usually skip over the Bulgarian rooms in Tucson, expecting nothing but formless, uninteresting sulfides and the odd amethyst. I happened to step into one however, and saw a pair of aquamarine crystals on a shelf. After a couple questions, I was surprised to learn that they were in fact Bulgarian.
There were two crystals, this was the better one. It is an etched floater, doubly terminated and very gemmy, with an exquisitely saturated color that does not come through in the pictures.
If you are a beryl collector, you probably won't see one of these again.