These hand made healing teething necklaces have been custom made in Latvia (Balkans) for La Bella (as you need a magnifying glass to thread them). They:
Are genuine baltic amber
Have as tough a string as we could find for such small pieces
A screw clasp (no metal)
Knots between each bead to help strengthen it
Baby tug proof but if a big toddler gave them a strong yank they may break (due to their small size)