Logic riddles

A pair of golden earrings was stolen from the jeweler. Four women were found on the scene of the crime and are being questioned. They all claim to be innocent, but no one else was in the jewelry department at the time. How does the detective prove one guilty?

Answer

The detective has another pair of gold earrings that look nothing alike the stolen pair. He shows each suspect the earrings and asks if they are the stolen pair. Everyone but the third woman replies "I didn't see them" or "I wouldn't know" but the third suspect says "No". That means she knows what they looked like. GUILTY AS CHARGED!

A boxing round was scheduled for 12 rounds, but ended after 6, because a boxer was knocked out, yet no man threw a punch. How is that possible?

Answer

The boxers were female.

Where can you find a 3 foot ruler?

Answer

At a yard sale.

There is a frog, dead in the middle of an island. If he swims north, the distance to the mainland is 2 meters. If he swims south, the distance to the mainland is 3 meters. If he swims east or west, the distance is 4 meters. Which way does he swim?

Answer

He can't swim, he is dead.

Clay has 100,000,000 pet fish all named fish except for one.
What is the name of that fish?

Answer

"Clay" because he is a fish.