Vintage Sterling Silver Crushed Turquoise Ball Chain Necklace

Vintage sterling silver ball chain necklace with round pendant with lightening bolt design on a crushed turquoise in resin background. Chain measures 18 inches length, pendant measures 13/16ths of an inch wide. Chain has tiny 925 stamp on clasp, pendant has stamps but they are too faded to read. There is a bell with a number stamp which is usually found on vintage pieces from Mexico. Both pieces acid test positive for sterling silver. G