They do appear to be Murano, but they are not geode bowls. They are normal ashtrays. Geode bowls look like a round rock that has been cut. The top is usually ground totally flat, then polished. I have seen bowls that are like yours with the colored rim attributed to 2 or 3 companies, but I do not know if anyone knows for sure. I do think we can safely say Murano. Hope this helps some.