Horrible customer service!  When I first got these pearls, I was so in love with them.  However, the clasp doesn't hold.  Whenever I wear them, I have to continually check them to be sure they are clasped.  I have no idea why they will not stay closed.  In addition, my neck broke out in an ugly rash where the clasp  was.  I contacted the seller and they said they would send me an email about returning them for a different clasp that perhaps will not have nickel in it.  No email has been forthcoming. I think two phone calls should be sufficient warning - so here is the ugly truth about the pearls.  I have a lot of friends that are scientists, and I am thinking of having them test the clasp to find out just how much nickel is in it.  The seller told me it is sterling silver and it may well be sterling silver.  It just isn't very flattering to have your neck all broken out in an ugly red rash - with pearls sitting over it.  Therefore, I cannot recommend these pearls as much as I'd like to.  I would NOT have purchased them if I'd known the clasps are defective and have so much cheap metal in them they cause my neck to break out in a horrible rash.