1st one I received had a speck right in the middle of stone, looked like something on surface but after trying to rub it off numerous times, realized it was an imperfection in stone. Returned and asked for replacement.  Amazon sent the 2nd one and overnighted to me and is much better with no huge glaring imperfections.  The chain is pretty cheap but I realize this will be the case for anything you only pay $160 bucks for.  Overall I am pleased and will be giving to my girlfriend for Christmas along with a matching set of 2ct black diamond earrings.