These truly do look like a snapshot of the Universe! Amazing green and black patterned stone, each being entirely different from the next. Jasper is an opaque form of quartz and comes in so many different colours and patterns. These are such a wonderful example of that.
Most of these focals measure 25-30mm and they come mainly in drop and oval shape with some other shapes as well.
As with almost all of our focals, they are side drilled at the top.