1997
Diamond Materials is formed with a joint venture involving H&K and Quentin Saienni
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About Us
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
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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