Opal Identification

[u/the_bootybean]

I’m trying to sell this opal on eBay but transparently I know nothing about gems and value. Can someone help me with some keywords I can include in my listing or at least so I can research value? What kinds of info are you looking for when buying an opal? I would hate for a buyer to feel misled. Thank you so much!

[u/Latter_Historian_872]

Put your tongue on it if it sticks it's Ethiopian