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