This is a 1960-70 era strand of Thermoset beads.
This type of screw clasp was used during this period
and Thermoset was a type of plastic resin that could be
made in all colors and in this case made to look a bit like pearls.
This necklace has a value of $30 to $45.00 retail.
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Thermoset is a type of formed plastic, not glass.
It is known to be heavy.