I have configured my account to use zsh as default shell -with one of the helpful Oh-my-zsh themes. The theme requires some special fonts and rich colour scale. When I switch to terminal (e.g. by Ctrl+Alt+Fn) or use some limited terminal emulator (e.g. embedded in IDE) it causes problems due to limited colourscale or fixed font.
How can I set the zsh with oh-my-zsh theme default only for gnome-terminal, so that the bash will remain the default one?