I know that when using gem install, the gem will be stored under /home/username/.rvm/gems/, under which gemset the gem was installed.
gem install
But if I use Bundl
If you want to find out where a particular gem is stored you can run bundle info . For example:
bundle info
user@host$ bundle info rake /var/bundle/ruby/2.1.0/gems/rake-10.4.2
For older versions of rake, the command could be bundle show .
bundle show .