Acid drinks including wine will react with the onyx and cause leaching into the drink. I'm not sure if that is harmful, or a useful source of minerals but it certainly spoils the flavour of red wine. I have some Onyx goblets and I have also noticed that some fruit juices become "fizzy" after just a few minutes residence time, which is a bit off putting, and led me to wonder the same thing as you.
I have found very little information on this on the English speaking web but my wife is Russian and we found a lot more about it on Russian language sites, basically corroborating the above, acid and Onyx are not good bed-fellows. One form of Onyx has low levels of naturally occuring radioactive material in it too, I don't know whether this is at a safe level or not or whether goblet makers avoid this type of Onyx. The verbal description of the greeny-white colour and marbled pattern of this kind of Onyx almost exactly fits my goblets, so after I read that I decided they should have more of a decorative than practical role in our house!
No, onyx is not flammable as it is a type of chalcedony mineral composed of silicon dioxide and is resistant to high temperatures. It is safe to keep onyx gemstones near heat sources without risk of catching fire.
yeah they drink from the goblet of fires that dumbledore fetches water from the river with
Absolutely not, as that item has been recalled due to a risk of lead contamination.
no it is not safe to drink.
Yes it is completely safe to drink.
Drinking out of a red goblet makes you look more dignified. It also is something classy to do when you drink wine, water, or any beverage. Most movie stars usually have a red goblet.
Yes, it is safe to drink old wine.
Yes, the water in Boston is safe to drink.
Yes, Worcester water is safe to drink.
safe enough to drink... contains caffeine and color dyes.
is it safe to drink water if lizard falls in it
All distilled spirits alcoholic beverages are safe to drink.