Any idea what is this? found in a field - 2 cm. But less than 1 gram.

Front and back

Do you have the size and weight?  And location?

This is possibly some kind of medal. There's a tip on the top which may have corroded where there was a ribbon.

If small enough maybe an astrological sign pendant.

Slipstreamed

Do you have the size and weight?  And location?

2 cm. But less than 1 gram. Malta 

That seems pretty light, is it aluminum?