The Diablo 2 Wiki
The Diablo 2 Wiki archive is available for anyone looking for information on Diablo 2. All information here is pre-D2R but contains a lot of useful information that is still relevant. Updated sections for new D2R features can be found on the PureDiablo Diablo 2 section


From Diablo 2 Wiki

Rare items are items with more magical attributes than magical. Containing up to three prefixes and three suffixes.

More information can be found on the item quality page. The magical quality levels are Normal, Magical, Rare, Set and Unique.