The simple things are sometimes also the most beautiful. I created a colored pendant, with different shades (depending on the PLA it has) with 1.2mm high discs.
I really like, with some prints like this, taking advantage of the possibility of obtaining prints with a mirrored effect by printing on glass. This is an excellent example.
I printed with line width 0.3 and height 04. You recommend printing the first layer at 150% and paying attention to the stitching. The discs are made of PLA. For the chain, TPU is fine, width 0.4, a single perimeter and height 0.3, three layers. She will be very flexible.

Unfortunately it doesn't look good in the photo but I assure you that the mirror effect is very attractive.

The discs are printed separately and assembled with a bit of glue.
Below is the link to the video where you can see it better.

https://drive.google.com/file/d/1TmSh3hbsgg-RHXc1IFGQwOlsBHvCGuvC/view?usp=sharing