That is pretty much what I read, Ivo -- that the word means "river." When looking at the things that I knew were clutha, I could see the flow of the bands, so understood. The calcedonio-looking vase in the link to me is a new look for clutha. I have a vase that has a similar rim. I thought my vase was calcedonio. Now I wonder if it is clutha. I included pictures below. The pictures were taken using flash, so the colors stand out a lot brighter than they are in normal light.