I have the black leather small Dionysus with crystal encrusted horseshoe. I tend to wear it more evening, whether it's a casual dinner with jeans and chunky loafers all the way to fairly dressy. I feel like it elevates a casual outfit or adds a bit of edge to something a little more classic or dressy.
Recently, I don't reach for it as often since I've switched to wearing mostly gold jewelry and I'm not sure how I feel about mixing metals. I do have a couple of two-toned pieces (i.e., my watch, a bracelet) that I always wear, so maybe that's enough to create a coherent look and I just need to get over myself.