What is the term for something that is really good but under appreciated by society?

I’m writing a paper about mangroves and i’m trying to describe them as unappreciated even though they do so much for humanity. The term is on the tip of my tongue. It’s like underrated but not quite. I used the term earlier today to describe one of my favorite bands. The term is basically describing something as really good but unrecognized by the common population. y’all please help me 😭