It was knitted with tulip stitches and spike stitches. Curve edge in square shape, together with vertical spike truly stunning. Both stitches are 100% Giezen design! you may follow either knitting description or chart, and cordially welcome you to share your work image at Ravelry .

Knit
Purl
Yarn over
Bind off
Slip 2 stitches kniw wise onto right needle, knit next stitch on left needle, pass 2 slipped stitches over the last knitted sts.