AKOYA PEARL PENDANTS NO FURTHER A MYSTERY

Lengthening can be achieved if pearls were never ever knotted.  incorporating knots adds some duration--usually an inch or two on the necklace.  Strands can be lengthened by having an extender chain, by incorporating some smaller pearls near the clasp or by mixing in other sorts of beads. I am not a jeweler so I am unable to repair some issues