Coring and Drill Stem Testing simplified 

With well-maintained equipment and qualified personnel

Diamond Core Testco, Inc. 

Servicing A Successful Well Takes:
Knowledge And Experience, But More Importantly It Means Having The RIGHT People Doing The RIGHT Thing At The Proper Time.

  • Conventional Coring
  • Drill Stem Testing

Conventional Coring-the removal of formations from the well bore (through mechanical means).

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​Office: 903-593-3458​ | Fax: 903-593-9757 24/7 - 365 Days a Year | Since 1955
Diamond Core was established in 1955 in Tyler, Texas by brothers O. D. (Doc) Shaver and Otis Shaver. 

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Jason Shaver

Owner & Operator

Cell: 903-330-2518

Office: 903-593-3458

Email Jason

Zach Shaver


Cell: 903-504-3134 

​Office: 903-593-3458

​Email Zach

Lynn Shaver

Owner & Secretary

Office: 903-593-3458

​Cell: 903-521-4267

​Email Lynn