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Yes. It's metal addition to glass. Cobalt for blue, strontium for red, led for green... etc. However amount of those metals is very low and enclosed in glass, it seems it's not a health risk. Even glass with very toxic uranium addition that is fluorescent in UV light isn't dangerous.
Read the 5Ss on this page. You'll see that color is very important when people judge wine. Colored glass wine stemware would eliminate that option for people who like to judge good wine.
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