I've been experimenting with the camera setup and took photos of these Mexican gold coins (I should probably find a black background for them). Just thought I'd share.
First, a Cinco Pesos coin (5 Pesos):

(0.1205 oz AU)
Then a Dos Pesos coin (2 Pesos):

(0.0482 oz AU) This one is tiny - the size of your pinkie nail. You often find this one worked into jewelry - rings, bracelets and such.