Go to any a hardware store for the hex-nuts. I chose silver but there's gold ones as well. Get some synthetic line to mix with the craft line so you can melt it on the knots you make with a lighter (that way it won't come undone so easily).
Make 3 Lines. Double over the line into a giant loop and make a knot at one end. Make sure the loop is about the right size to fit a hex-nut through tightly. It will be used as a makeship clasp.
Braid the three lines together just like hair, until you get to what you've decided is the middle section of the necklace. Then add one hex-nut per braid.
I got three different sizes so I can taper them and make the middle larger like this.
Then braid it the same length on the other side and at the very end tie on one more hex-nut to put through the loop you made on the other end. Once again if you used synthetic line, flash a lighter over the knot to melt it together so it's nice and strong.
Voila! Kinda looks like fish bones.
Hex-nut necklaces make me smile, and I hope they make you smile too!