Rings on the fingers can indicate your inner character.

Forefinger: ambition, need to enhance your ego.
Middle finger: Materialistic nature.
Ring finger: This is conventional and is only noted if there are multiple or large rings adorning it. If this is the case then emotional or creative frustration could be present.
Little finger: It is common to see this in the gay community. Otherwise it could indicate difficulties in sexual expression.

Many rings on the hand shows somebody who is wearing emotional armour and is relying on outer things for their wellbeing.

Spielberg's large and fleshy hands, with short fingers, shows an energetic and practical nature. Here's someone who won't let the grass grow under his feet! Note also the the way the little finger stands out from the rest of the hand.

The Iron Lady has a hand to match her nature. She has a very prominent forefinger, showing tremendous self-confidence and driving ambition. Note also the long thumb: this shows great willpower and a stubborn nature.