I bought some of the Pella coated blades for my Gem from a forum member and they are good. While I was waiting for them to arrive I went to the local pharmacy and bought a pack of Gem blades. Upon receiving the Pellas I found them to be identical in shaving quality and markings. You might try the pharmacy if you have yet to shave with the Gem. I think the pack of blades cost me $6.00.
"We shall not cease from exploration And the end of all our exploring Will be to arrive where we started And know the place for the first time". T.S. Eliot