Welcome to Koop Diamond Cutters, LLC™

When you work with Koop Diamond Cutters, you are choosing a third-generation family-owned business based in Cincinnati. Our customers always receive the highest quality fine jewelry and service at the most competitive prices. You can count on our highly-trained and experienced artisans to create and craft a unique and beautiful piece sure to become a meaningful family heirloom. Using our state-of-the-art Interactive Custom Design System (ICDS), we create pieces as unique as the wearer.

Koop Diamond Cutters, LLC

"The ring you have designed for my nephew is as unique and beautiful as the woman he's giving it to. You have another customer for life! I'll be more than happy to give Koop Diamond Cutters glowing referrals whenever the opportunity arises."

"Thanks for taking care of the estate jewelry for us. It was great to go to someone we trust since we have no experience in these matters."
~Beth and Mike

"I love the necklace! People comment and admire it, but best of all, I feel so close to my parents when I wear it. You are wonderful - creative, passionate, and you listen. You have great talent and you are using it."

At Koop Diamond Cutters, we employ the skilled craftsmen and modern technology needed to handle any project. We perform all design, repair, and creative work on-site, so you can rest easy knowing that your valuables remain in our care from start to finish

We can assist you with any of the following services:

  • Jewelry Repair & Restoration
  • Ring Sizing
  • Half Shanks
  • Full Shanks
  • Adjustable Shanks
  • Polishing & Cleaning
  • Chain Repair
  • Clasp Replacement
  • Charm Attachments
  • Bail Repair & Replacement
  • Rhodium Plating
  • Prong Tipping
  • Prong Head Replacement
  • Gemstone Replacement
  • Gemstone Cutting & Polishing
  • Jewelry Inspection
  • Koop Custom Design: 3D CAD Modeling
  • Hand Carved Wax Models
  • Fine Metal Casting
  • Machine Engraving
  • Estate Jewelry Acquisition
  • GIA Graduate Gemologist Appraisals

Visit our Services page for more information. Other services we offer through trusted affiliates: Watch Service ~ Hand Engraving ~ Pearl Stringing