My first guess, they look like they're from a Rado, Movado or something similar. Couldn't find any images on the web, but WTF can help me!

Pin/Sleeve attachment between links, each link weighs 2.9-3.0 grams/per. 16mm wide and 2.4mm thick. Looks/Feels like ceramic but heavy like tungsten?!

Mostly silver-tone with "gold" stripe on each side.

Any thoughts appreciated! Thanks :)!