Calacatta Oro is a marble interpretation that features dark brown veins with gold accents. The slab is designed to not be overpowering or too bold in your space but; to simply bring together a beautiful color palette. Calacatta Oro - Calacatta Gold Quartz is a Large Quartz Slabs - With Book Matched Veins. Calacatta Oro is one of the best selling slabs because it has marbled white backdrop that sets the perfect stage for taupe veins to intertwine throughout.