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We are open Tuesday through Saturday,
12:00 p.m. to 5:00 p.m. (Appointments Recommended)

We are open Tuesday through Saturday, 12:00 p.m. to 5:00 p.m. (Appointments Recommended)

Diamond Services

The Only Diamond Cutter in DC

Diamond Services Diamond Services

Starting its journey as a custom jewelry designer and manufacturer over a century ago, Market Street Diamonds has expanded its services as a full gemological service provider since 2009. At present, we are the only diamond cutter in the mid-Atlantic region.

Dino Lozano, our Chief Gemologist, heads our team of GIA certified diamond professionals who are ready to assist you in all gemological needs. Our gemological lab is equipped with the latest ultra-precision machined and equipment you can rely on for our services' quality.

Whether your diamond is damaged one, heirloom vintage cut, or even if it is a rough diamond, our master diamond cutters can optimize its value and appearance. We can also accurately analyze and pre-grade diamonds and gemstones and get them certified through reputed partner gemological labs.

Meet our Master Gemologist

MSD Gemologist

Dino Lonzano G.G.(GIA),MBA

Our Master Gemologist, Dino Lonzano, is a Gemological Institute of America graduate in Diamond Essentials, Colored Stone Essentials, Jewelry Essentials, Gem Identification, and Colored Stone Grading. Dino was born into the business, and grew up helping his dad and Uncles at their shops in Silver Spring, Maryland with jewelry creations and luxury watch repair. Now with more than four decades of experience, Dino has literally seen, cut, and valued millions of dollars’ worth of diamonds and colored stones.

Diamond / Gemstone cutting

Diamond Repair/Re-cutting

Diamond Polishing

Rough Diamond Analysis

Diamond / Gemstone Analysis

Diamond / Gemstone Appraisals

Custom Laser Inscribing

Removing Inscriptions

Removing Inscriptions

Diamond Sorting

Meet our Master Gemologist

Dino Lonzano, Master Gemologist

Dino Lonzano G.G.(GIA),MBA

Our Master Gemologist, Dino Lonzano, is a Gemological Institute of America graduate in Diamond Essentials, Colored Stone Essentials, Jewelry Essentials, Gem Identification, and Colored Stone Grading. Dino was born into the business, and grew up helping his dad and Uncles at their shops in Silver Spring, Maryland with jewelry creations and luxury watch repair. Now with more than four decades of experience, Dino has literally seen, cut, and valued millions of dollars’ worth of diamonds and colored stones.

“Your concept, our Expertise, Together We Crate!”

Read what our clients say about us

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For over a century, Market Street Diamonds has built its reputation based on a tradition of distinctive, devoted excellence and service. Founded by a sixth-generation Belgium diamond cutter, Market Street Diamonds opened its doors to provide exquisite, never-before-seen diamond cuts to a growing New York City elite. Over one hundred years later, we proudly continue the diamond renaissance, delighting in quality, craftsmanship and imagination.

Dino Difference

We are the first in the industry to promote ethical sourcing

Conflict Free Diamonds

We are the first in the industry to promote ethical sourcing

Eco-Conscious Enterprise

We care for the planet we live, & committed to find greener ways to create value

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