As a 2d object, a diamond had four sides. As a 3d object, there are many different types of diamonds, all with their own numbers of vertices, edges and faces.
6 edges.
it is a 3D shape with 8 faces 8 edges and 6 vertices if you want a picture of it type in pcures of 3D diamonds.
A pentagonal prism will have 15 edges.
No corners and two edges !
I believe it would have nine edges.
22
15
12
8
Twelve.
6 faces, 12 edges