Pattern Notes
In the example shown, I used worsted weight yarn, and a "G" hook.
To begin, ch 2.

Row 1:  2 sc in 2nd ch from hook; ch 1 turn. 2 sc.
Row 2:  2 sc in each st; ch 1 turn. 4 sc.
Row 3:  2 sc in 1st st, sc in each of next 2 sts, 2 sc in last st; ch 1, turn. 6 sc.
Rows 4 & 5: Work even on 6 sts; at end of row 5 ch 1 turn.
Row 6: Sl st in 1st st, 5 dc in next st, sl st in 3rd st, sl st in 4th st, 5 dc in 5th st, sl st in 6th st, ch 1, do not turn.

Border - Sc in end of each row to point, 3 sc in point, sc in end of each row to beg of 5 dc shell, *1 sc in 1st 2 sts, 3 sc in center st, 1 sc in next 2 sts*, sl st in space between shells, repeat from * to *, sl st to join to 1st sc. End off. Weave in ends.