Market Street Diamonds
Custom Engagement Rings made in DC
Enjoy the most exclusive diamond jewelry collection in the nation's capital, handmade in the USA.
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.
Get direction to the showroom:
2512 Pennsylvania Avenue NW,Washington, DC 20037
Book an Appointment ⋙COVID-19 Safety Precautions
Mask Required
Safe Distance
Temperature Checks
Regular Sanitizing
Fresh from the Bench
Discover our latest creations
Fresh from the Bench
Discover our latest creations
An Awe-inspiring & Unique Engagement Ring Collection
Visit Us
HOURS: TUE - SAT 12:00 PM - 5:00 PM
(Appointments Recommended )
(202)-552 -5744
RedBox@marketstreetdiamonds.com
2512 Pennsylvania Ave NW,
Washington, DC 20037
Custom Engagement Rings Made in DC
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.
Read clients' reviews:
Browse our Collections
Your Imagination is our Creation
Create Custom Engagement Ring
Your Imagination is our Creation
A perfect custom engagement ring design needs virtuoso artistry, a seamless client-designer dialog, and immaculate craftsmanship. This is what we do best.
The Process
04 Crafting
05 Your Ring
06 Your 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.
Why Market Street Diamonds
There are few things we do different
Red Carpet Customer Care
Genuine 5-Star reviews do come for the best
Red Carpet Customer Care
The Highest Rated Local Jeweler in DC
Boutique Experience
4D Design Approach
Respect & Empathy
Originality
More about Dino Difference >Forever Care & Share Program
Lifetime Care
Free upkeep every 6 month your diamond ring
Learn more >Dino Dollars
Your satisfaction is an investment & our referral program lets you earn your returns.
Learn more >Red Carpet Customer Care
5 Star Ratings by Professionalism & Candor
We Create Things In-house
#MadeinDC with 114 years of Artistry
& state of the art technology
We Create Things In-house
Proudly #MadeInDC
Quenchless Passion for Originality since 1906
Modern Design Studio with State-of-the-Art Technology
Diamond & Gemstone Cutting
GIA Certified Team of Professionals
The Studio >Jewelry & Watch Services
We are a full-service Jeweler
& the only Diamond Cutter in the Region
Jewelry Appraisals 
We perform jewelry appraisals all kinds of jewelry accepted for insurance, liquidation, and other legal proceedings. One of our GIA graduate gemologists will take measurements and pictures of your item on the shop floor while you can keep your eyes on your precious piece. Ther is NO need to leave the jewelry with us. The appraisal will be emailed to you in 2-business days.
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 comes to life, completing a journey from a 3D model to the actual piece.
CAD/WAX Designs
We have a team of top-notch 3D model designers ready to work with you on computer-aided design (CAD) of any complexity. Our studio is equipped with state of the art 3-D printers to turn your designs into wax models.Also, for more intricate designs, we provide handmade wax model services.
Watch Appraisals
We are an AWCI (The American Watchmakers-Clockmakers Institute) approved watchmaker. We provide appraisals for all brands of luxury timepieces.
Watch Repair/Restoration
We are an AWCI (The American Watchmakers-Clockmakers Institute) approved watchmaker. From simplest needs such as battery replacements, strap adjustments to complete overhauls of your luxury timepieces, you can get it done from our watch department.
Jewelry Repair/Restoration
We are one of the few full-service jewelry stores in the region with an in-house designing studio and a manufacturing facility. We do all kinds of jewelry repairs and restorations, may it be simple prong tightening or turning your jewelry piece to a new design. Cleaning and polishing are done while you wait.
Laser Inscription/Engraving
You can get your custom message engraved into your diamond girdle or on the ring itself with us. We provide laser or manual inscriptions to all jewelry or any other items made with gold, platinum, or silver.
Appraisals
- Jewelry & Watch Appraisals
- Insurance/Replacement Value
- Liquidation Appraisals
- Estate Appraisals
- by GIA certified Team
Bridal Services
- Engagement Ring Consultation
- Custom Designs
- Wedding Band Consultation
- Diamond Consultation
- Flexible Financing Options
Jewelry Services
- Custom Design & Manufacturing
- CAD & WAX Model Services
- Engraving
- Gold & Platinum Recycling
- We Buy Gold Program
Jewelry Repair
- Cleaning, Polishing, & Plating
- Resizing, & Adjustments
- Vintage Jewelry Restoration
- Resetting & Replacing Stones
- Rebuilding & Tightening Prongs
Watch Services
- Battery Replacement
- Watch Overhauling
- Repairs & Replacements
- Watch Appraisals
- Strap Adjustments & Replacements
Gemological Services
- Diamond Cutting & Re-cutting
- Diamond Grading
- Rough Diamond Analysis
- Gemstone Cutting and Polishing
- Laser Inscribing
Specialty Services
- Custom Gift Designing
- Diamond/ Gemstone Scanning
- 3D Printing
- Jewelry/ Gemstone Photography
- Diamond Buying Program
Dino Difference
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