It's true, it's a microscope slide and can be worn as a pin OR a pendant. The slide as are 1" x 3". They are either trimmed in silver, copper or gold. The pin/pendant fixture is steel with a gold plate and is discreetly glued behind the top of the slide. They are quite sturdy, hey, they use them in labs.
They are quite the conversation piece!
FYI-the slides are brand new and have never been used. Why such a disclaimer, well, I've been asked at art fairs. I'm a big fan of recycling but not if it means there was something toxic on it.