Keystone Granite has for the past 25 years worked with the residential market providing all types of different surface countertops. Since the late 90's, our focus has been on elegance and excellence towards the Granite and Quartz Countertop industry in San Antonio and the surrounding areas. Keystone Granite offers competitive pricing, prompt turnarounds, consistent top quality workmanship, and friendly helpful customer service. This spirit is backed by state-of-the-art machinery. From laser digitizers to CNC machines, we produce countertops that consistently fit perfect every time – all the time.