Can an under-mount corian sink be replaced without replacing the countertops?

I have solid surface corian countertops, and a white corian under-mount sink that appears to be attached. I don't love the countertops, but replacing them with granite would be very expensive. I really hate the sink though. I can't tell if that sink could be removed or if removing it means removing the countertop. I'd love to replace it with stainless. Does anyone know if this is possible?