fa-gem
was added on FontAwesome version 5.0 and Discourse uses version 4.7.0. The 5.0 update should happen in the next version (the next 6 months).
For now check @tshenry post about using non-Font Awesome icons: Change the Like icon
fa-gem
was added on FontAwesome version 5.0 and Discourse uses version 4.7.0. The 5.0 update should happen in the next version (the next 6 months).
For now check @tshenry post about using non-Font Awesome icons: Change the Like icon