Vintage Bevel Plastic 'Crystal' Necklace

A nice vintage necklace that looks like crystal or glass, but it's super light so I think it's plastic or maybe lucite. I would guess it was made in the 1980-1990s era but I'm not sure. It's a fun piece to have and wear with other jewelry. It's a costume jewel but looks like a higher end costume jewel, but it isn't. It's in good condition for the age. I never wore it but it was not new when I bought it some time ago. Please see photos for approximate measurements and details.