Vintage Green Brown Chunky Amber / Resin ?? Bead Necklace ** READ **

Found at a country yard sale

Old crackle glazed beads with bubbles and inclusions, quite marbled, being very uniformed gives me doubt that they are real. I believe the clasp ( although vintage) has been replaced ! I have taken very close up pictures for clarification. Have not carried out any testing other than black light shown in pics.

Lovely beads either way !!

Would welcome any opinions