Diamond-cut shape grid , but circular

[valentinov (Valentin)]

Good evening, Does anyone know how to make this shape? I’ve nearly lost my mind trying to figure it out. I saw people making it in Rhino, with a diamond tool, but I have no clue how to make it in Blender

[oo_1942 (Kim)]

Try the Decimate modifier.
fsf.blend (1.2 MB)