Unless it is marked sterling or has etchings that indicate it is real gold - it isn't.
It is a bombilla like someone previously posted.
I learned about these when I was in Brazil many years ago - to drink Yerba Mate (a tea that tastes like - as one person said " I've heard many colorful turns of phrase used to describe this unique flavor, but the one I liked best was "a combination of lightly smoked wood, weak coffee and flavored hay." A mix of "green teaand coffee, with hints of tobacco and oak," was another favorite.").
Many times is marked alpacca silver which isn't sterling/silver as you are thinking. They are made with many different metals for decorative purposes. Typically with a gourd if used in the true sense.