This free pattern originally published in:
Spool Cotton #132, Irish Crochet Lace 
Size 16
Materials:
Use one of the following threads in size 50:
Size 16
Materials:
Use one of the following threads in size 50:
Edging is made of rosette and shamrock motifs, joined while working.
No. 8267 INSERTION 8267-A … Insertion is made of individual rosette and shamrock motifs, joined while working.
Medium Size
Materials: J. & P. Coats Tatting Cotton, 5 balls.
Milward's steel crochet hook No. 13 or 14.
Materials: Choose one of the following threads in White or Ecru:
Clark's O.N.T. Mercerized Crochet, size 50, 7 balls.
EDGING 8337-A … First Motif … Starting at center, ch 6, join with sl st. 1st rnd: 12 s c in ring; join.
EDGING 8268-A … Edging is made of individual sections, joined while working.
Make a chain slightly longer than desired length.
First Motif … 1st rnd: Starting at center of shamrock, ch 15; in 15th ch from hook make s c, ch 15, s c, ch 15, s c (3 loops).