ShiQiao SplSerotonin Necklace for Women Dopamine Molecule Necklace for Girls Girlfriend Geek Gifts for Chemist Doctor

I bought it for a friend she loves her necklace and wears it all the time.

Very cute! I'm a science nerd and got this to wear for my new job. Sadly, it turned my neck green after just a few wears.

Chain Turn black after few days of wearing

For the price this is a lovely necklace, very pretty and comes exactly as shown. I can't say how it fares after long term use but I've worn it twice out and about and it's still going strong.