When you buy through our links, Business Insider may earn an affiliate commission. Learn moreBlue Nile's Anniversary Sale features hundreds of dollars off rings, necklaces, earrings, and more.Blue Nile/Insider"Diamonds" and "affordability" are rarely words associated with each other, but for a limited time, you can find plenty of jewels on sale from Blue Nile.Blue Nile is already one of our favorite jewelers because it offers some of the most affordable engagement rings you can buy.