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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, gives us a unique ability to provide our customers with superior end results. 

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Diamond's History

1997
1997
2000
2000
2006
2006
2008
2008
2009
2009
2010
2010
2012
2012
2012 Recycling
2012 Recycling
2013
2013
2019
2019
1997

1997

Diamond Materials is formed with a joint venture involving H&K and Quentin Saienni
2000

2000

Richard E. Pierson, Jr. and Michael K. Pierson purchase Diamond Materials with 80 employees
2006

2006

Diamond doubled capacity with upgrades to the Asphalt plant
2008

2008

Diamond added a Portable Crushing and Screening operation
2009

2009

Diamond added Cold-in-Place Recycling
2010

2010

Diamond Materials purchased Harrington Pit in Delaware
2012

2012

Tri-County Materials was formed in Dover, DE with a joint venture between George & Lynch and Diamond Materials, LLC.
2012 Recycling

2012

Diamond Materials formed R&M Shingle Recycling Company
2013

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

2019

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

Organizations