This is a great and common question we get since launching our Authorizing Selling program.
At the moment, Stripe Balances and Gemini Balances cannot be transferred between each other. You can transfer your Nifty Balance to your Stripe Balance for cash outs, but cannot transfer Stripe Balances back to Nifty.
The fundamental reason being that Stripe Balances are never dormant. From the moment you send a balance to your Stripe Balance, they're en route to the account you have on file with Stripe, which you can see by going here and choosing Open Dashboard.
Frequently Asked Follow - Up: