Copying gems from previous version of Ruby in rbenv

How do I push a gem to RubyGems?

From the main menu, select Tools | Gem | Push Gem. In the Run tool window, specify your RubyGems credentials. Your gem will be published to RubyGems.org.

I installed Ruby 1.9.3-p286 with rbenv. Now, after installing a newer version (p327), obviously, it doesn't know anything about the GEMs installed with the previous version.

Is it possible to copy Gems from that version to the newer one, so that it won't be needed to download them all again?