Ana, you have some great answers! I think they might be a tad over-priced. I have a 30" strand of fresh water pearls the same diameter and they were about $75, but I know that was a really good deal.
I've been looking at other pearl necklaces and I'm struck with how you really have to see them IRL and try them on. The Ralph Lauren Outlet store near me had a short choker necklace that I fell in love with. They were costume, but I didn't care because they were the right size and length. When I went back to buy them, they just seemed dull and too white. Sadly, I left them behind. I'm sure if you ordered these online, you could return them if they didn't work out for you.