You are not marketing this very well.  I've never heard of black amber and I can't think of a reason why I would want it.  Give me a reason to want it.  The whole reason I would want amber jewelry is because it is not black and is translucent with interesting colors and sometimes stuff inside!  I want Jurassic park on my wrist.  I've also never heard of a unisex wristband.  You should just leave that out since it will just cause confusion.