If you have an extra Diamond Key in your inventory, you can gift it to a friend. This feature will be available if you have unlocked all Exclusive series in all travel locations.
To gift a Diamond Key, first, select the Diamond Key icon at the bottom of your screen.
A window will pop up, congratulating you on unlocking all series. Select "Gift your Diamond Key to a Friend" at the bottom of the window.
A second window will appear, allowing you to choose which friend you would like to gift your Diamond Key to. Find your friend by scrolling, or by typing their name or user ID in the search window. Select your friend, and click the green "Send" button.
Finally, a window will pop up confirming that your gift has been sent. Your friend will receive an email, a message, and a notification in their log telling them that they have been gifted a Diamond Key.
How do I purchase Diamond Keys?
Diamond Keys can be purchased in the Hatchlings Marketplace. For more information on Diamond Keys and Exclusive series, click here.