I got this necklace for Christmas and within the first week I got it, the knots came undone!  Luckily, I make jewelry, so it was an easy fix!  Its been fine ever since!  But I only single knotted it!  So lets hope it lasts!  I was very disappointed when it broke... BUT at least I was able to fix it!  Its a very pretty necklace though!  Ive gotten LOTS of compliments on it!  So THATS a plus!!!  Would not recommend for someone who doesnt know how to make jewelry though!  Of course you can always look it up online, DIY projects how to make an adjustable necklace.  Itll bring up LOTS of results!  So, if you do buy the necklace, just be aware you might get one that is faulty like mine...