If you play Gem Rush using a Steam-linked account, Steam can now tell you when it's your turn in an online game without you needing to open the game to check. You can also launch the game directly into a specific session from the notification screen.
Steam will ask you if you want to receive notifications the next time you log into Gem Rush through Steam.
To see your current notifications or adjust notification settings, you can navigate in your browser to
(your Steam profile URL)/gamenotifications
If it is currently your turn in any games, a link will also show up under Steam's green mail icon.