Diamond Core was established in 1955 in Tyler, Texas by brothers O. D. (Doc) Shaver and Otis Shaver. Back in the early days, the company thrived during the East Texas Oil boom in the 60's and 70's. Providing quality service to the independent operators of East Texas. The company's reputation has grown along with its customer list. Throughout the years, we have provided our services to Mom & Pop independent operators as well as Major Company's in the industry. Sixty years and still growing, Jason Shaver, Otis's son is now the owner/operator. Zach, Jason's son is following in their footsteps.