Originally called the three mystic apes (plus one). The three monkeys are Mizaru, covering his eyes, who sees no evil, Kikazaru, covering his ears, who hears no evil, Iwazaru, covering his mouth, who speaks no evil and the new comer Shizaru, covering his jewels who symbolizes the principle of do no evil.
Here is where the four four wise monkeys bring it all together. Each primate has its specialty.
Iwazaru speaks no evil and will tell you if your goods are suitable for auction.
Mizaru sees no evil and will look to see what your objects are worth.
Kikazaru hear no evil and listen to what you need when it comes to moving your you goods.
Shizaru does no evil whose expertise is precious metals (including the family jewels).