At The Diamond Authority, we believe in transparency and personalized service. With over 100 years of combined experience, Jeremy and Dave are the true authorities on diamonds and fine jewelry in Portland. As the most experienced jeweler in town that shows you the invoice for a GIA-certified mined diamonds, we take the mystery out of buying a diamond. Here, you won’t encounter any pushy salespeople—because you’ll be working directly with Jeremy and Dave, the owners, and experts behind The Diamond Authority.