It appears to be a commemorative "medal" for the election of the Catholic church's Pope Benedict the 16th (XVI in Roman numerals).
Pope Benedict XVI - Wikipedia, the free encyclopedia
A relable way to figure out whether it is made of solid gold or is gold-plated metal is to precisely measure its diameter and weight. For example, a 22-karat US $50 Gold Eagle bullion "coin" is 32.7 millimeters in diameter and weighs 33.931 grams.