Koop Diamond Cutters, LLC

Clarence “Whitey” Koop founded Koop Diamond Cutters on April 1, 1966 (which makes it a fun day to celebrate our company’s birthday). Whitey received his nickname for his trademark bright white shock of hair (pure white from his childhood). Initially, Whitey focused solely on cutting diamonds. When his son Butch began working in the business, Butch demonstrated a flair for design, creating custom Koop jewelry pieces on an individual basis. 

In 1974, Butch founded a new business, the Cincinnati Casting Company, where he could design and cast precious metals into the shapes needed for custom jewelry. Butch Koop operated Cincinnati Casting Company under the same roof as Koop Diamond Cutters for a few years until the men decided to merge the businesses. 

Butch’s son Justin joined the business in 1997, and he has expanded even further. They now offer a full manufacturing facility, along with a retail center for fine jewelry. Today, Koop Diamond Cutters can take on any kind of fine jewelry project from custom designs to restorations to repairs.  

"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."
~Denise

"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."
~Kathy