You can earn gems by solving problems and creating projects:
5–10 for solving a problem of the day.10 for repeating All Recommended Topics.15 for implementing a stage of your project.25 for completing a project.100 for the first problem solved via IDE.100 to show solutions of other learners for a project's stage without solving it. (This is available only in a limited number of projects, and never for the last stage).25 to save your daily progress with a 1-day streak freeze.You can also exchange gems:
1 to place a bounty on your comment, and the best answer will receive it.1 to award a gem to any comment you like using the "gem" emoji.
Right now there is no option to buy gems, but we might add this feature in the future.