Rel=canonical Tags
If the site is having product pages divided on the basis of color, sizes or other variations then it is recommended to use a rel=canonical tag.
More help can be found here:- https://support.google.com/merchants/answer/1224784?hl=en
Pagination Tags
If the site displays product lists across multiple pages then use the pagination tags to tell Google that your content is spread across multiple pages and that should be treated as one page.
Read more:- http://googlewebmastercentral.blogspot.in/2011/09/pagination-with-relnext-and-relprev.html
Rich Snippets
Implementing rich snippets on the product pages are a great way to let Google know about the price and other specifications of the individual products. Rich snippets are a great way to provide users with additional data. Although rich snippets do not help in resolving duplicate content issue directly but it can a great hint to properly analyze the contents of the page. Also adding ratings and reviews rich snippets enables users to add comments on the individual product pages and you can get valuable unique content for your individual product pages.
Some more help:- https://support.google.com/webmasters/answer/172705?hl=en
http://www.seosandwitch.com/2012/08/rich-snippets-in-google.html
Use Unique Content
Probably the best way to make your site stand apart is by adding unique content on every page. This will take time and effort but it is the best strategy to follow in the long run. Have a look at the video of Matt Cutts below:-
Also See:-
