Bertoli is a white quartz with bold grey detailing that resembles veining in marble. Its cascading pattern gives Bertoli a natural look, mimicking the appearance of marble. Della Terra® Quartz, a natural quartz surface, is a blend of nature and technology. It combines beauty and functionality in a high performance surface. Della Terra® Quartz consists of up to 94% quartz, one of the hardest minerals in nature. Color controlled quartz is blended together with technologically advanced polymers. Because of its high quartz content, Della Terra® Quartz surfaces are ultra-durable and resistant to scratches and chipping. Its dense composition also makes Della Terra® Quartz highly resistant to staining. Della Terra® Quartz should be used for interior surfaces only.