Sadly, it's a jewellery copy of a
silver coin. I couldn't find any pictures or mention online of a genuine gold coin of Tigranes II, and there aren't any listed in my Sear catalogue; they either don't exist or they're extremely rare.
And I'm not sure it's gold - a coppery colour appears to be starting to show through on the high points. How did you test it for gold, a touchstone test, or specific gravity? It could be gold-plated, which would fool a touchstone.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis