The first step in selecting an edge is to consider the use of the mirror. (Images do not represent actual Edging of glass.)
Measure the diameter
What type of Edging should I choose?
How To Measure Your Custom Cut Mirror
How to measure with ruler.
Seamed Polish Edge:
Glass edges are sanded to a dull sharp edge. This is to make the glass safe to handle. Seamed edge is used if the glass is to be framed and in projects where the edges are not visible.
Beveled Polish Edge:
The edges of the glass are cut and polished in an angle. The bevel width around the glass can range in size from 1/2" to 1 1/2".
House Polish Edge:
Sanding the entire 1/4" edge resulting in a matted finished edge.