Keystone Marble and Granite is a leading supplier of marble and granite serving residential and commercial clients in Delaware, Pennsylvania, and Ohio. With 25 years of combined experience, their team offers an incredible inventory of materials imported from around the world, including popular engineered stone brands. Customers praise Keystone for its amazing price, quick installation turnaround times, and exceptional customer service. The staff is friendly, professional, and knowledgeable, providing expert advice and guiding clients through their selection process. Clients also appreciate the opportunity to view different materials and the professional installation service by skilled technicians. The finished work is consistently beautiful and exactly as promised, with many reviews highlighting the precise measurements, spot-on cutting, and excellent installation. Overall, Keystone Marble and Granite is known for delivering high-quality products and services that leave customers satisfied.
If I could give Keystone more than five stars, I truly would. From the moment I stepped into their conveniently located showroom, I felt confident I was in the right place — but I had no idea just how exceptional the entire experience would be. I’m extremely particular and very detail‑oriented, and Keystone didn’t just meet my expectations… they exceeded every single one of them with ease, professionalism, and genuine care.
My granite countertops are nothing short of breathtaking. The craftsmanship is extraordinary — the edging, the corners, the onsite fabrication — every detail is a work of art. I struggled for weeks trying to find a piece of granite I… read full review
Sep 2026
5.0★★★★★
Had Keystone install full kitchen countertops on a house in middletown and they did an amazing job with the granite installation. Highly recommend you to check out their showroom, they have a wide selection of quartzite and granite. Prices are great, ask for Tuba she is great to work with
May 2026
5.0★★★★★
Excellent experience from beginning to end. Helen was great at executing the look we wanted for our kitchen with the colored quartz and design. She was patient with us as we changed our minds a few times an even cancelled the order to only return to process it because they are that great! Oscar was a pleasure to work with along with Delores and Raman (hoping I spelled your names correctly). I own a local kitchen, bath and basement business and I can proudly say they have all my referrals for my clients stone! Thank you so much. We are extremely happy with the quartz and the process.
