When it comes to sunglasses colors and styles have different rules. If you want a timeless neutral sunglass for summer you are safe sticking to black, metal, or tortoise colored items. Since it is timeless you can feel safe spending a little extra, but you definitely to not have to.
Here’s Alexa Chung with some awesome Karen Walker Tortoise sunglasses:
Below are some tortoise options from froogle friendly to damn.