The ancient Greeks used it to make lyres. The Romans used it for furniture. And we use tortoise shell for sunglasses. Well, not really. The trade of tortoise shell has been banned since 1973, but the look, one of my favorites, thankfully remains. Why? Its pattern varies greatly but in general is warm, natural and works pretty much universally, making it literally, timeless.
A few of our favorite tortoise shell sunglasses:
Hampton 46 by Garrett Leight
Nowhere to Run by Otis Eyewear
Fort Knocks by Knockaround