When it comes to accessories, nothing's been more popular lately than layered jewelry. From bold woven bracelets to chunky metal watches, it's important to invest in simple pieces that can be mixed and matched forever. Elegantly piled onto fingers, rings are especially chic when stacked. After thoroughly researching the Internet's most unique jewelry vendors (Hello, Etsy!), we've compiled a list of ten stacking rings that are customizable and timeless.