ASSORTMENT OF CUFFLINKS FROM THE 70"S

I AM NOT SURE IF THESE ARE GLASS OR SEMI PRECIOUS STONES,THE PURPLE PAIR SEEMS CRYSTAL CLEAR,AND I SUSPECT THAT IT IS GLASS AND NOT AMETHYST,AS I WOULD HAVE LOVED,THE PAIR THAT LOOKS LIKE CLUMPS OF ROCK,ALSO FEELS LIKE GLASS,AND THE RUBIES ARE SIMULATED,I SHOULD THINK SO,BUT I LIKED THEM AND BOUGHT THEM,FOR THE DAYS THAT I FEEL BOLD ENOUGH TO WEAR THEM.