Granite Tile Around Fireplace

I have 12x12 black granite tiles for around my fireplace and 18x18's for the hearth but not sure how to install either. The 12x12's will be cut in half so will have a little less weight to them. Will they stick to sheetrock w/ the right adhesive? And should durarock be put down first before applying the 18x18's or can they go directly onto the plywood?

Thanks,
Anna