To add a decorative ridge along the shell’s change-color row, use a Front Post Cluster edging.
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Video: How to Crochet a Shell
(If you don’t know how to make the shell stitch, read the blog or watch the video demonstrating the shell stitch.)
After working a single crochet shell row (a row that begins and ends with a single crochet and shells in between), turn the fabric to the wrong side.
On the wrong side join the new color into the first single crochet of the previous row. Make a regular single crochet with the new color in that same stitch.
Chain two. (Chain two on either side of the cluster.)
Across the double crochets of the previous row’s shells, work a front post cluster using double crochets. Of course, you can use a longer stitch such as a treble/triple crochet if you prefer.
Front Post Cluster (FPcl): *Yo, insert hook from the front to the back (the reason it is called a front stitch) and to the front again under the first double crochet post of the shell, lifting the post up. Yarn over, pull the yarn around the post, yarn over and pull through two loops on the hook. (Half of a double crochet made.) Leave remaining loops on hook. Repeat from * until all double crochet posts of shell have been worked. Yo and pull through all loops on hook. Lock cluster with slip stitch.
End the front post cluster row, with chain two and single crochet into the last single crochet of the previous row. Turn fabric.
The next row is a half shell row. In the Sherbet Shell Baby Blanket (available at Free Patterns Simple & Sensational™) I used seven double crochets for my shell so half a shell would be four double crochets. Chain three for the first double crochet. Make three more double crochets in the same stitch. A half shell is now complete.
Working into the new color, make a regular single crochet into the slip stitch (top of cluster). Make seven double crochets (shell) in the new color’s single crochet. Continue the pattern across the row, ending with four double crochets (a half shell) in the last single crochet of the previous row.
This edging adds a pop of color along with texture to a basic shell pattern.