| Hi Effisk,
I agree with Jeremy in that no kind of bad knotting can cause that kind of damage. It is most probably the type of drilling Jeremy describes. Silk or nylon thread will not cut into a pearl unless the drilling is off.
There is also the possibility that the necklace you saw was at some point strung on one of those nylon coated wires. But I think it is the drilling.
Slraep |