Costume Jewellery

Turquoise costume ring

Barabra Bixby 
Multi-gemstone flower ring
Sterling silver & 18 ct Gold

A costume ring is a ring designed to wear with the current fashion and is usually made of non-expensive materials.

http://www.merriam-webster.com/dictionary/costume%20jewelry

Engagement Rings

Engagement ring
14 ct White Gold
Diamonds

Engagement ring
14 ct White Gold
Diamonds

A engagement ring is a ring that is given to a woman to wear on her ring finger to show that  she is ingaed to be married.

http://en.wikipedia.org/wiki/Engagement_ring

Domed Rings

Domed ring
Rhodium plated sterling silver
Cubic Zirconias 

Domed ring
White flower
Sterling silver
Crystals

A domed ring is a ring with a big domed top  that taperes down. It makes the ring look large and heavy.

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

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