I recently bought these sweet little butterfly stud earrings crafted from 14k solid yellow gold at a yard sale. The home was neat and smoke free, but I also ran them through my jewelry cleaner, as well. The intricate design and attention to detail are clear indications of a reputable maker, but I don't recognize the ZZ mark. (Some posts I read suggest it relates to metal purity.) 585 on both the posts and the butterfly backs suggest to me they are imports. These earrings, while not large or fancy, are perfect for those who appreciate nice jewelry and love butterflies. The 14k metal purity and yellow gold metal mean their value will only appreciate over time. I'm posting them as a 7 day auction with free shipping and no reserve. Check out my 100% satisfaction rating, and good luck bidding!