There are two (2) borders made up of two (2) medium width lines. The inner one drops off as it rounds the curve of the stone's shoulders. The outer one continues over the hump of the shoulders and forms the outer border of the side panels.
Remark
This very deteriorated stone still reveals a bit. The tympanum contains a centered face image. The head and eyes are round. The depiction of hair resembles both the lozenge shape piece and the wild hair extending from the skull. Some eye details are still visible.
There are/were side panels to the left and right of the tablet but their artwork is worn away.