30" Vintage Faux Amber 70's Lucite Pendant and Beaded Necklace

Beautiful vintage piece from the 70's. Measuring 30". I am the original owner. Well made. This has been restored/restrung on silk thread and cleaned. This piece of jewelry is quality Lucite Resin, not glass or plastic. What is the difference? Lucite looks like Amber, but the weight is heavier, so pieces will sink in the salt water test.