Combine olive oil, thyme, basil, rosemary, garlic, lemon zest, salt and pepper in a bowl. Dip lamb chops into mixture to coat evenly. Cover chops and refrigerate for at least 30 minutes. Preheat grill. Place lamb chops on grill over a medium high heat. Grill about 5 minutes per side. Chops should be browned on both sides.