It contains a live Monarch Butterfly that flies around inside a jar. There are other types of jars like this that can be found throughout Skyrim; each jar contains a different insect. It is one of many insects found living in Skyrim.
There is an inscription on the inside of all of the insect jars. The markings are diagrams of the insects contained in the jars. The inscription on the butterfly reads what looks like a "D" then an "I" and a backwards "D", the two "D"s representing the wings and the "I" the body.
- Unlike the Bee in a Jar and Dragonfly in a Jar, and like the Moth in a Jar and the Torchbug in a Jar, the Butterfly in a Jar does respawn.