Not with PT. In order to get some decent caustics, you'll need to use the PMC kernel in Octane. It's way more efficient at solving complex refraction and caustics. I've done some decent ones with PMC kernel. Nothing I've tried in Octane seems to produce the excellent caustics that miraculously occur with Luxrender for some reason. Not sure what it is about their algorithm that produces such beautiful refractive and reflective caustics, but it takes forever.