The customer came in with a chain which she wanted some links added to. Unfortunately she didn't have any links for me to add. I had to make them instead. You can see the ones I made by noting that the originals are hollow and have a seam.

And here is a close up to show the detail

In this close-up you can also see a difference in color. It doesn't show readily in person. They are both 18K yellow but hers is Italian and alloyed a bit differently than is mine.