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Assume that you are already using the teddy gemset.

$ rvm gemset use teddy
Now using gemset 'teddy'

And that you now wish to switch back to using the default gems directory for the currently selected ruby.

You can accomplish this using gemset clear:

$ rvm gemdir
/Users/rys/.rvm/gems/2.1.1@teddy
$ rvm gemset clear
gemset cleared.
$ rvm gemdir
/Users/rys/.rvm/gems/2.1.1

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