Diagram of tab edge ("bleeding heart edging")

Begin at red circle, closed with a sl st (left out). After you make the circle, do the 6-ch turning chain at left, and continue from there. Notice where the tab connects to a V-st, there is no turning chain on that side.
Little circles are ch stitches. Black ovals are sl st's. Crosses are dc's. Ovals are long picots. x's are sc's. That's all it takes to make this appealing edging.

Corrections welcome.

Pics of sideways "spines" that many narrow-end edgings use (2 real patterns below)

All these examples use 6-ch turning chains. Diagram of V-stitch spine at end.

V-stitch 

Double V-stitch

Shell: One side hollow, other side solid. Each solid side is made in previous hollow side.

Split double shell (3 dc each side). Shell made in space in middle of double shell.

Diagram of V-stitch spine