HMM Always hard to tell from just a picture. If I had it in my hand I could tell you right away that its pyrite and Ill just go ahead and toss it for ya... Ya Im playin. It looks like gold to me but it is VERY polished looking. Most big gold isnt that shiny raw. Poster above has it right, Hit it with a hammer. If it smooshes/dents its gold and if it fractures its pyrite. Good luck!