The Green Stone Eyes or Stone Eyes (G) are a Drop from Stone Women in the Castle Dungeon. They have a 1/3 chance of being dropped when it is killed in the Green Phase. The four other Stone Eyes can be obtained by killing the Stone Women on one of its other four phases, with a 1/3 chance for each. It can be sold to the Museum for 25,000 Coins, for a total of 125,000 coins from all five Stone Eyes.
After adding the Green Stone Eyes to the Museum, it can be examined to show the following message:
A good defence against an attack is to go for the eyes. Except these.