To be clear: I don't feel as if there was anything dishonest about my time as a Jewelmint member. It was always clear to me that it was a membership service and that I would incur monthly fees. My membership was cancelled on the same day I requested it to be cancelled. I called in and did not get a human, so I also sent an email, and received a prompt reply confirming that my membership had been cancelled. I was never charged again.
However, the jewelry I received was of such poor quality that even my two stars are generous, despite their customer service being satisfactory. Even the necklace I got at 50% off was not worth the $15 -- it broke after being worn once and I had to repair it myself. I expected the mock glass/stone bits to be some kind of artificial material, but not so obviously plastic. I didn't think it would be worth exchanging after reading the other reviews here. It looks very cheap and "costumey" and I only wear it as a statement piece at large parties/clubs where no one is going to spend long looking at it. It's unfortunate, because many of the pieces look to be well-designed, but the construction is of even lower quality than the stuff you could get for $8-10 at H&M, Charlotte Russe, Primark, or whatever your local cheap clothing shop is.
Keep away... unless you are super rich and also enjoy wearing super kitschy plastic jewelry?