If you find that you need more gems, you can purchase them through a few different options and payment methods.
First, click the “+” icon next to your Gems Total in the game screen, or the “ADD GEMS” button at the top of the page.
You will then be taken to the Purchase Gems screen, which will display what Gem packages are available for your area and their costs. Simply follow the onscreen instructions to purchase as many Gems as you want!
Please Note: The payment options available to you are dependent on the platform you are playing on, and are not something that Rumble has any control over (outside of RumbleGames.com). If you have questions regarding the payment options available for your chosen platform, please contact the appropriate support groups provided by that platform.