TUE - FRI 11:30 AM - 6.00 PM, SAT 11:30 AM - 5:30 PM (Appointments Recommended)

MSD Company LogoMSD Company Title

Diamond Engagement Rings & Wedding Bands
Since 1906

Dino Lonzano creates custom jewelry designs in a dynamic range of styles, from classic to contemporary, to cutting edge. At Market Street Diamonds, everything is handmade in-house.

An Awe-inspiring & Unique Engagement Ring Collection

Discover Engagement Rings
Made in DC logo#MadeInDC
Made in USA logo#MadeWithLove
Made in USA logo#MadeInTheUSA

Showroom & Studio

2512 Pennsylvania Avenue NW,

Washington, DC 20037

Get Direction


TUE - SAT 11:30AM -5:30PM

(Appointments Recommended)


CALL 202-552-5744


Book an Appointment

Create a custom engagement ring with Dino Lonzano

The perfect custom engagement ring design takes imagination and artistry, and an open, honest and trusting relationship between designer and client. Making that design a reality takes immaculate craftmanship and precision. Nobody knows this process like Dino Lonzano and the GIA-trained team of jewelry professionals and gemologists at Market Street Diamonds.

Steps to Design Your Custom Engagement Ring

Engagement ring consultation at Market Street Diamonds

STEP 1 - Consultation

We build your ring idea to CAD design

STEP 2 - CAD Design

We print your design to a wax model

STEP 3 - Wax Model

We bring your design to reality.

STEP 4 - Crafting

Collect your finished engagement ring

STEP 5 - Collect Your Ring

The last step of the custom engagement ring creation is your proposal

STEP 6 - Your Big Day

Wedding Bands
The Ultimate Symbol of your Love

Create the wedding band in perfect match to your engagement ring, and the band for him that brings the synergy of love into a beautiful bond of two souls.

Discover your dream wedding ring from our exclusive collection of eternity bands, diamonds ring rings bearing rich assortment of classic and modern styles, or build your own unique ring with us.

Happy Market Street Diamonds Couple on their Wedding Day
Happy Market Street Diamonds Couple on their Wedding Day
Happy Market Street Diamonds Couple on their Wedding Day
Ladies Bands
Gents Bands

Market Street Diamonds
Your imagination. Our creation.

Browse the most exclusive diamond jewelry collection in the nation's capital, all handmade in the USA. Select from designs in a multitude of styles, from vintage to modern, or use your imagination and allow Dino Lonzano to create a custom piece that's truly one-of-a-kind.

From our distinctive diamond engagement rings to timeless handcrafted jewelry, we'll show you stunning options that don't just commemorate, but elevate any occasion or emotion. Whether it's an engagement, a wedding, an anniversary or a self-congratulatory whim, Market Street Diamonds can help to make it uniquely unforgettable. Whether you're looking for necklaces, pendants, bracelets, earrings or rings, count on the rarest quality and unparalleled precision. Whether you're interested in diamonds, sapphires, rubies, emeralds, tanzanite, tourmaline or South Sea pearls, we have the finest on the planet. And whether you want 18-karat gold, palladium or platinum, no one delivers like Dino Lonzano.

Visit the Market Street Diamonds showroom and jewelry studio, conveniently located at the gates of Georgetown, and let us introduce you to Dino Lonzano and his designs. Dino and his GIA-trained team of passionate professionals will assist you in locating or creating that intimately personal, breathtakingly beautiful and enduringly memorable treasure you've been dreaming of.

Happy Market Street Diamonds Couple on their Wedding Day
Happy Market Street Diamonds Couple on their Wedding Day
Happy Market Street Diamonds Couple on their Wedding Day
Happy Market Street Diamonds Couple on their Wedding Day

Jewelry & Watch Services
We are a full-service jeweler & the only diamond cutter in the region

Jewelry Repair/Restoration

We are one of the few full-service jewelry stores in the region with an in-house design studio and a manufacturing facility. We do all kinds of jewelry repairs and restorations, whether simple prong tightening or turning your jewelry piece into a new design. Cleaning and polishing are done while you wait.

Jewelry Appraisals

As a manufacturer to the trade, Institutions, and retail consumers coupled with years of global sourcing, it provides a natural edge of substantial experience. Excited to be the only jeweler in DC with the AGS (American Gem Lab) credentials and a minimum of three GIA (Graduate Gemologists) professionals available to you on any given workday. Our appraisals are respected by all foreign and domestic insurance companies. We welcome you for a complimentary analysis consultation.

Custom Jewelry Designs

We design and handcraft unique custom jewelry pieces that you dream of. When you bring your design ideas to us, our professional jewelry designers will be working in person with you in a synergistic creative process. You will see your idea come to life, completing a journey from a 3D model to the actual piece.

CAD/WAX Designs

Our partnerships and investment in sophisticated international technology afford us a reputation as leaders in conceptual 3D design. Imagine a concept brought to life in high-resolution quality natural 3D images and a physical wax resign model for you to try on. Our services are limitless. Your imagination. Our creation.

Watch Appraisals

Master Horologists via AWCI (The American Watchmakers-Clockmakers Institute) approved watchmaker. We provide appraisals for all brands of luxury timepieces.

Laser Inscription/Engraving

You can engrave your custom message into your diamond girdle or on the ring with us. We provide laser or manual inscriptions to all jewelry or any other items made with gold, platinum, or silver.

Watch Repair/Restoration

Master Horologists via AWCI (The American Watchmakers-Clockmakers Institute) approved watchmaker. From the simplest needs, such as battery replacements and strap adjustments, to complete overhauls of your luxury timepieces, you can get it done from our watch department.