Hmm, I’ve never seen anything quite like this and I’m not exactly sure how I would describe it. Maybe something like “eclectic three-strand nugget, shell, and bead necklace on heishe.” I don’t believe it’s Native American made–to me it looks a little too mish-mashy to be Native American and I’m seeing some materials that I’ve never seen in Native American jewelry: quartz-like stones and whatever those red balls are. The findings I believe are commercial and the stamped lines on them are probably a design or brand mark that came on them, not an artist’s hallmark.
I would also say that things like this aren’t necessarily either/or as in either authentic (I’m guessing you mean authentic Native American) or an import. It could have been made in the US by someone who wasn’t trying to pass it off as Native American, in which case it would fall between those two extremes (although I do suspect some of the materials are imported). Those are my thoughts, but I’m interested to here other people’s opinions.