Directions for crocheting the rings are here:
http://blog.makezine.com/craft....._necklace/

I used DMC Cotton Perle size 5 (which around here is available in a million colors at the craft store next to the embroidery floss). I like it because it's nice and shiny. You could also use embroidery floss or any kind of thinnish yarn. You don't need very much - I had three 27 yard skeins, one in each color, and there is a good bit of each left over.

Oh, and I used a very small crochet hook to get a tight look. I have a set of teeny steel ones for lace making and stuff. The size I used was 1.5 mm.

The metal rings were the hardest thing to find. I used something like the left-most rings in this link. Flat and around 1 inch in diameter. They were in the jewelry making section with the beads. I think you could use round rings too instead of flat but the necklace may not sit as flat when you wear it.
http://www.michaels.com/Multi-.....lt,pd.html

I then sewed them together in the bib shape, and added a ribbon tie at the back. You could also do some type of crocheted chain closure or use metal chains.

Will add a couple of photos when I get home tonight. You should definitely try it, it was a lot of fun!

ETA: photos of the one I made for natalie.

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