Since this was recently discussed on ICON, I thought I would post a photo of the second one known here. You can see the [id=220382356; other known piece] as well. There are more wisps of purple in the ears of this one compared to the other, where they are more solid.
This one has a fracture or two in the ear, but are you going to get picky when you have a colored piece like this? As commented before, this is like the purple/ice blue CD 151's and the [id=207782990; purple/ice blue CD 280]. The latter is a "only one known".
Perhaps all of these were poured from the same batch of glass?