Keystone Hardscapes 81846 Anchor™ Diamond Pro Stone Cut® Retaining Wall Stone Chicago Blend. The Anchor™ Diamond Pro Stone Cut® Series has brought the latest look and appeal in architectural design with its addition of the two smaller modular components. The new three piece system separates itself by creating alternating scale and dimensions. The product's patented splitting technique results in more natural appearance in the edge profiles. This softer edge creates more amenity in the facing of the wall. While the system still meets the rigorous demands for both engineering and structural components, its multiple shape patterning creates new and innovative applications for site work design.