The Diamond Authority

Welcome to The Diamond Authority

Portland’s Premiere Appointment Only Jewelry Experience

The Diamond Authority

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.

What We Offer

Loose Diamonds

We are your local and trusted experts in earth mined & lab grown diamonds. We are the only jeweler in Portland that will show you the actual invoice of a GIA-certified earth mined diamond and guarantee you’ll only pay 20% above invoice. Come see us and find out why our customers love us and other jewelers hate us.

Custom Design

Unique bridal rings and tailor-made jewelry that you won’t find anywhere else.

Jewelry Repairs

Expert craftsmanship to restore your precious pieces.

Gold & Silver Buying

We pay top dollar for your unwanted gold and silver.

Experience the Tower of Diamonds!

Take a private elevator ride to the 4th floor of Lincoln Tower on Greenburg Rd, right across from Washington Square. Experience the difference of working with seasoned professionals who bring their expertise and passion to every appointment, all while enjoying exceptional savings.

Client Testimonials

1000+ GLOWING REVIEWS

Great customer service. Don’t waste your money or time at big box stores. Jeweler on site repaired my ring. It felt like it used to be when you had the town jeweler help you.
Patti Howard
Great customer service and willing to work with you. Great experience with them.
Stratton Turpen
First rate service, always communicate well about any purchases. Got my wife’s stunning engagement ring, wedding ring, my wedding ring and more here. Never once anything other than pleased with my choice!
Will Harden
I needed an adjustment to double channel set diamond ring, which was done beautifully with a clear focus on quality and great customer service. Also, incredible selection of jewelry in-store. Highly recommend this establishment!
J.
As always quality service, expert craftsmanship and knowledge of receiving the very best product!
Dan Woods
The best experience every time! High class establishment, and amazing jewelry. Always leave feeling taken care of and happy.
Brian Buckmier
Outstanding service, staff and values. We are so pleased with all the purchases we’ve made there. We continue to go back time after time.
Ken Steckler
Lovely store and staff. Repair one on time and was beautiful.
Geralyn Wiechert
Fabulous customer care: suggestions, full disclosure, friendly and outgoing!!!
Duff Minor
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Book Your Appointment Today

Ready to find your perfect piece? Schedule your visit and see why Jeremy and Dave are Portland’s top choice and your authority for fine jewelry.

A Century of Expertise

With over 100 years in the industry, our legacy of knowledge and skill ensures every piece is crafted to perfection.

Jewelry for Every Moment

Whether it’s a milestone celebration or a simple “just because,” our collection has something perfect for every occasion.

Diamonds for Every Preference

Choose between natural diamonds and sustainable lab-grown alternatives, each offering unparalleled beauty and brilliance to fit your values.