@m3mom - my experience was hit or miss. I got the violet colored one that was broken on arrival then the turquoise looks 100% authentic (J.crew class, package) and is great.
Really like this set. Love that you are already thinking Spring :) I am totally ready. I have a pair of shoes that look just like Chain ones that you have here. Mine are silver and I try to wear them with shorts too <3 The necklace is gorgeous. I can't pull this off though, But I admire it on others.