Meh, the problem with this unbelievably valuable treasure is its TOO valuable. A tiny chunk of one of those stones could buy a town. The entire necklace could buy all of callan and maltak combined, with enough left over to buy off the elves and establish a foothold in the semashi lands. Noone has the kind of money it would take to buy that thing. Best bet would be to break the hell out of the necklace and sell it chunk by chunk, but even then thats just begging for entire armies to be sent after you to kill you and take what amounts to more money than exists in the world.

It would be like if in the real world you found a 1200 carat diamond. Good luck living long enough to find a buyer for it that could give you fair value.