CUSTOM Engraved Address Marker Stone Rock 7-8 Inch Stone Address Street Marker Housewarming Gift Ideas. Every Engraved Stone Marker is made to order. This engraved stone River Rock measures 7-8 inches. Great for a garden, beside your front door or a door stopper. Also is a perfect housewarming gift for a new home owner. Just leave me the details in the Comments Section during checkout.