Bands

Bands
Titanium

Bands
Sterling silver

\A plain band that is usually given to a bride or to the groom at a wedding.

http://www.thefreedictionary.com/wedding+band

Dress Rings

Dress ring
Titanium
Diamonds

Dress ring
18 ct White gold
Diamonds

A dress ring is a ring that is casually worn for no special purpose like engagement, so it is not worn on the ring finger. 

http://wiki.answers.com/Q/What_is_a_dress_ring

Eternity Rings

Eternity ring 
Palladium
Diamonds

Eternity ring
White gold
Diamonds

A eternity ring is a ring with stones set all the way around  the ring with no metal in between giving it an endless (eternity) motion.

http://www.ask.com/question/what-is-the-meaning-of-an-eternity-ring

Cocktail Rings

Cocktail ring
Matthew Campbell Laurenza
Enamel sapphire ring

Cocktail ring
Swarovski 
Crystal flower ring
18 ct gold

A Cocktail ring is a big bulky ring that is usually worn to cocktail parties.

http://www.wisegeek.com/what-is-a-cocktail-ring.htm

Signet Rings

Signet ring
Corporate signet ring
Sterling silver

Signet ring
Vintage Tiffany & Co. Scottish Crest Signet Ring
14 ct gold

A Signet ring is a ring that has a engraved signet on top of the ring (a symbol). This ring is also known as a Seal ring

http://www.thefreedictionary.com/signet+ring

Cluster Rings

Cluster ring
Gold
Sapphire and diamonds

Cluster ring
9 ct gold
Fiery opal and blue topaz stones 

A cluster ring is a ring that has many stones set in a cluster setting that forms a focal point of the ring.

http://en.mimi.hu/jewelry/cluster_ring.html

Solitaire Rings

Solitaire ring
White gold
Diamond

Solitaire Ring 
White gold
Diamond

A solitaire ring is a ring that has a focal point which is a single stone. Some solitaire rings can also have side stones next to the centre stone.

http://www.ehow.com/about_5399556_definition-diamond-solitaire.html