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Diamond Materials, LLC. was founded in 1997 in Wilmington, DE as a heavy highway and site development company. The company purchased by the Pierson’s in early 2000 spent the next decade with the goal of becoming a more vertically integrated company and quickly earned the reputation as one of the premiere heavy highway and site development contractors in the tri-state area. Based on a culture instilled by the Pierson family of a strong work ethic and integrity, our work environment has thrived and empowered all employees to excel with opportunities for growth and development. 

 

Our culture coupled with our unwavering attention to safety, quality and detail, with the use of leading-edge technology and sophisticated machinery give us a unique ability to provide our customers with superior end results. 

 

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Diamond's History

1997

Diamond Materials is formed with a joint venture involving H&K and Quentin Saienni

2000

Richard E. Pierson, Jr. and Michael K. Pierson purchase Diamond Materials with 80 employees

2006

Diamond doubled capacity with upgrades to the Asphalt plant

2008

Diamond added a Portable Crushing and Screening operation

2009

Diamond added Cold-in-Place Recycling

2010

Diamond Materials purchased Harrington Pit in Delaware

2012

Tri-County Materials was formed in Dover, DE with a joint venture between George & Lynch and Diamond Materials, LLC.

2012

Diamond Materials formed R&M Shingle Recycling Company

2013

Diamond Materials purchased Don Rogers, Inc. and expanded our foot print in the New Jersey construction market to include 2 sand and gravel pits

2019

Diamond Materials now employs more than 200 people and provides services in the tri-state area
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