I have been looking at this design as an everyday piece - (18K yellow gold) - but would only be wearing it on the silk cord as I didn't care for it on the chain. I tried on both the medium (on a slimmer cord) and the large (on a thicker cord). I like the look of the cord for a casual look - plus the contrast of the gold and black. Which size? I am 5'4" slim to medium build. Here are my thoughts... I like the daintiness of the medium - but in the past I think that I often choose jewelry that I later think is too small for me. I also like the large - but I am afraid that now larger pieces up around the neck are in style - but perhaps in a few years it will look dated (too large and chunky). Any advice? Also is this style only for younger women? Do you think it would look foolish on a 50-ish (I hope I look like a young 50)? Also I searched the posts and someone mentioned that they wear theirs on a mesh chain - which sounded like a nice alternative - would it have to be the large one then. Thanks for any input.