Jewelmint is a hit or miss in my opinion. I own at least 20-25 items of jewelry from them (which seems kind of crazy) and I'm always anticipating arrival as sometimes the product is slightly different than pictured on the site.
My main gripe with them is their INCONSISTENCY. Some of the items are immaculate quality - something I'd expect from a designer brand and some of it has been poor. I own lots of rings and I highly recommend purchasing rings from them if you find a style you like. My Jewelmint rings are some of my every day rings (one I've worn well over 200 times and it's still in perfect condition).
I highly recommend searching google for reviews as well as the Jewelmint Facebook page photos. Some users will post photos of the product they received which is hugely helpful as sometimes the photos on the site are misleading.
I recommend skipping every month until a good promotion comes along. I just got a promotion for 4 rings for $40. Great deal, as the quality is much better than the things you'd purchase at Forever 21 for $10.
I have never received broken items, but it does happen. I only once received a ring that wasn't assembled correctly, which was a bummer but I didn't return it.
I've never been charged after skipping a month.
Would I recommend? Yeah, but I only recommend if you score a good promotion. $30 is a little high for some of their items. Skip every month until you see something good.