Everyone's Favorite Game: Guess the Gem

[pokerface]

Took a chance on an "unknown" gem I feel is quite likely to be an indicolite tourmaline. It's way nicer than I thought it would be, but I'll return it if it's not a natural gem. Any other guesses??

 

[musicloveranthony]

Upon first glance, I'd say tourmaline.
I'd also wonder if it's not a treated synthetic or treated cheap stone. It does look dichroic, though, and I'm not sure if treated stones can do that

 

[stracci2000]

Irradiated green topaz

 

[Double E]

Looks like there’s blue, some slightly yellow flashes in the quite saturated green.

 

[Gigisdiamonds]

Took a chance on an "unknown" gem I feel is quite likely to be an indicolite tourmaline. It's way nicer than I thought it would be, but I'll return it if it's not a natural gem. Any other guesses??

Green Tourmaline

 

[pokerface]

Update: @stracci2000 was correct, it is an irradiated topaz! Glad I got it tested in time to make a return. This was an important reminder that there really is no such thing as an "unknown" gem on ebay - if a vendor thinks there is the slightest chance a stone would be valuable, he/she would have it tested.