This was constructed from the ground up including a masonry block and firebrick structure. The stone was from the Natural Stone Veneers International, Inc and is called Chardonnay.
The arch and keystone were designed to hide the 1" thichness of the stone. Note that the arch curves upward and also around the face of the fireplace which required highly skilled masons. We specifically used a ratio of larger sizes and adjusted our color range for the project.
The supplier was Graniterock in Cupertino California.