TUE - SAT 11:30 AM - 5.30 PM

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

Watch Services

50 Years of Experience You Can Trust

Over 50 years of watchmaking experience. The Watch Division of Market Street Diamonds is the most qualified, convenient, affordable and reliable source in the Mid-Atlantic Region for repairs, testing and warranty service for your fine Swiss timepiece..

We are more than pro watchmakers. We developed our own line of luxury military watches - lonzanowatch that we are very proud of. The watch line has been available for the enthusiasts since 2012.


Member of American
& Clockmakers Institute

Lonzano Watch collection available in store

Time Products Sold New, Previously Enjoyed and Vintage Collector's Pieces

Master watchmaker with a specialized focus on watch servicing and repairs

Diagnostic Examination

Assessment, Cleaning & Servicing

Watch Case Disassembly & Polishing

Timekeeping & Calibration

Pressure Testing & Waterproofing

Quality Control

Expert Appraisals

"50 years of watchmaking & clockmaking experience that you can trust!"

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View Lonzano Watch Catalog

Inspired by vintage combat aviation designs, and built with high-end swiss movement, the Lonzano Watch is the choice of exceptional men who cherish the spirit of adventure

Lonzano Watch Catalog

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

Dino Difference

We are the first in the industry to promote ethical sourcing

Fifth C is for Conflict Free

Conflict Free Diamonds

We are the first in the industry to promote ethical sourcing

Echo friendly enterprise

Eco-Conscious Enterprise

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

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