Uranium glass or as it is called vaseline glass is not rare and is fairly inexpensive unless you have a very rare piece !! It was made by several mfrs !! It would cost more for an appraisal than it would likely sell for !! If you know the pattern just look on ebay for the selling price !! Not the asking price but what it actually sold for !! Look on the left of the page for completed and sold prices !!