
family owned, precision driven, passion-fueled
At Cornerstone, craftsmanship runs in the family. Founded by Miguel Amador in 2018 as Three Brothers, our company evolved into Cornerstone in 2021—reflecting a new chapter while staying rooted in our original values. Now joined by his brother German and sister-in-law Amanda, this dedicated trio brings hands-on experience, integrity, and a personal touch to every project.
craftmanship with heart
With over a decade of experience in the stone industry, we specialize in the fabrication and installation of natural stone and engineered surfaces. Whether you're updating a kitchen, building a custom home, or managing a large-scale commercial project, we deliver high-quality, innovative results that reflect our deep commitment to excellence. Whether you’re a homeowner, designer, or contractor, we look forward to helping you bring your project to life with professionalism, care, and expert craftsmanship.
your vision, your stone
From material selection to final polish, we’re with you every step of the way. We offer flexible selection options to fit your style, schedule, and space:
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Browse our curated selections in our showroom
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Visit one of our trusted local stone distributors
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Work with us virtually from the comfort of your home
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In-home consultation so we can recommend the right materials for your unique space
Fast, Precise, and Professional
Once you’ve chosen your material, we schedule a template appointment to capture detailed measurements of your space. This allows us to fabricate your custom surfaces with precision and efficiency. We pride ourselves on a fast turnaround and reliable scheduling—so your installation happens smoothly and on time.
Allison Kafka
"Loved my experience working with Amanda and the Cornerstone Marble & Granite team. I presented them with a design and vision and they executed it so well! They were hands-on, detail-oriented, communicative, and I am so happy with the results!"
Nataly Herrera
Liv by Designs Studio
""From the initial consultation to installation, they were professional, knowledgeable, and attentive to my preferences. The fabrication is exceptional! I highly recommend Cornerstone for anyone looking for beautiful countertops and top-notch service."
Victoria Tramontano
"Amazing work! Fast and reliable. Always paying attention to details. As someone who owns their own renovation company, working with Cornerstone has really been such a great experience."