I love ceramic and art glass jewelry. Back when I was dressing for work in the corporate world, I had several sets of lapel pins/earrings. I did break a few pins, mostly from carelessness -- tossing my jacket into the passenger seat at the end of the day -- but never while wearing the garment. Kilt pins might have it a bit tougher, getting banged against counters, bar stool legs and the like.

I just purchased a pendant from these folks at a local bead show. They had some lovely Celtic design pieces but nothing that would "compete" with what you are considering.

Good luck and keep us posted! I did just enough pottery in college to A) fall in love with it and B) realize that I'd need a lot more practice to produce anything worth showing off. . .