In my opinion, spending $163 USD on very poor quality is $163 that cannot be saved to purchase something far nicer in the future. I would return the pair for a refund.
Pattye is on the mark! Keep in mind, if the pearls are under 5mm, you may not want many knots on the necklace as they can begin to take away from the look. You can knot every 3 or 5 pearls or even just the last few on each of the ends. Experiment and see which look you prefer. Another thing to...
May I ask, is one of the pearls the third from the end of a strand? If so, I would suspect that glue has been used. If you have access to acetone, I would give it a try.
I agree. Soldering is one of those life skills like learning to ride a bike. Once you learn how to do it, it's really not difficult...plus it's a whole lot of fun to use a torch!
I have a slightly different approach. Please try these before attempting to bore out the hole by drilling. It may be possible that some glue from the knots have traveled into the drill holes, effectively cementing the thread to the inside of the pearl. Drilling a very solid lump of glue could...