For your consideration, I have a Vintage Glass Ceiling Light Shade.  It is round and is 11-1/4" diameter and 4-1/4" deep.  The center hole is 1/2" diameter.  No chips or cracks - there is an imperfection in the glass about 3" x 2" - see last 2 pictures.  It is not too noticeable on the frosted side.  Comes from a smoke free home.  I will be listing several vintage items so check out my other listings as I will combine shipping on multiple sales.