I bought these expensive earring backs & am very unhappy. They come sealed in hard plastic, that you have to cut them out of. I couldn't differentiate this plastic from the earring backing (which I was unaware of its existance, photos are not that clear) Thinkinking it was an all-metal backing, when I cut them out of the plastic, I also ,unfortunately removed the plastic earring backs! Then, one of the earrings came out of the package with the tiny post it was delivered on, stuck inside the earring back. I do understand how these work, I clamped onto little bit of tiny post that was slightly poking out & I slipped my nail in pulling that part of the earring back, expecting it to loosen & come off. IT DID NOT COME OFF!! It took me approximately 1 hour or more to finally release the ting post! This causes concern for putting it on an earring post through my ear! I don't want them stuck!
  I decided to practice witb some of my earrings, but off the ear. It did not lock / clasp on some at all, but most concerning were the earrings they locked on. They didn't lock until pulled back to about 1/8th from end/ tip of post & kind of dangled there. They also removed so easily that I would not wear for fear of losing earring!  I was better off with a tight butterfly earring back! I am hoping I can get my $50 back! I never should have purchased, but thought it would be a good, working investment to keep me from losing diamond studs. I hope there is another way to contact the seller. Want to be sure Ill get $$ back before returning?