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, gives us a unique ability to provide our customers with superior end results.
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1997Diamond Materials is formed with a joint venture involving H&K and Quentin Saienni
2000Richard E. Pierson, Jr. and Michael K. Pierson purchase Diamond Materials with 80 employees
2006Diamond doubled capacity with upgrades to the Asphalt plant
2008Diamond added a Portable Crushing and Screening operation
2009Diamond added Cold-in-Place Recycling
2010Diamond Materials purchased Harrington Pit in Delaware
2012Tri-County Materials was formed in Dover, DE with a joint venture between George & Lynch and Diamond Materials, LLC.
2012Diamond Materials formed R&M Shingle Recycling Company
2013Diamond Materials purchased Don Rogers, Inc. and expanded our foot print in the New Jersey construction market to include 2 sand and gravel pits
2019Diamond Materials now employs more than 200 people and provides services in the tri-state area
2021We open a field office in South Planfield, NJ and currently employ over 400 people
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