Here was some of my inspiration.
And here is how I made mine.
I used an anchor charm (you can find a huge variety of these on Etsy) and brass chain. You can use any type of chain or ribbon, rope, string, leather cording...the list goes on!
All you need to do is attach the anchor charm to the end of your chain (or whatever you use) and then create a loop at the other end.
The bracelet is secured by pulling the loop over the bottom of the anchor.
Such a cute and simple nautical bracelet! If you have no interest in DIYing this, but like this, I put some in my shop for a very reasonable price.