Google is showing both old & new URLs in indexing despite 301 redirection

Hi There,

I have recently rewrite few URLs to make them SEO friendly and put 301 redirection on the OLD URLs so that Google start showing new URLs in searches.
The redirection is done properly But what I have encountered now is Google is showing both OLD and NEW URLs in the indexing and infact OLD URLs are showing previous caching too. But when I tried to open the URL directly from the Browser it redirected to new URL. Please review the below URLs.

OLD URL: https://www.allforskolin.com/what-is-forskolin/
Redirected to NEW URL: https://www.allforskolin.com/forskolin-supplement-pills/

Google Indexing Showing both URLs: https://www.google.com/search?q=site:allforskolin.com&num=100&gws_rd=cr,ssl&ei=JNclVqnPBMm0uAT6u6KYDg

Caching of OLD URL: https://webcache.googleusercontent.com/search?q=cache:-MJeNLXN9t8J:www.allforskolin.com/what-is-forskolin/+&cd=7&hl=en&ct=clnk

Caching of Same URL after Redirection:
https://webcache.googleusercontent.com/search?q=cache:https://www.allforskolin.com/forskolin-supplement-pills/&gws_rd=cr&ei=etklVreGA4KfugT98JqIAQ

Please help me so that I fix it at the earliest.