Every now and again you might come across some polished travertine. This looks a lot like polished marble with one very notable exception. As noted in previous posts, the travertine stone polishes, but the fill does not. This gives lower grades of polished travertine a splotchy look. Some factories also use a resin for fill rather than a color matched cement. This improves the polished look, but costs considerably more.
If you are one of those people with a polished travertine in your place, take a look at some care and maintenance information from StoneTech Pro.