Hello harshaan224,
Thank you for reaching out to Apple Support Communities, and we'll be happy to help in any way we can. We understand you have questions about replacing a Beats Studio Bud. Check out this article for what do to if you lost a Beats Studio Bud, and how to go about replacing it: If your Powerbeats Pro, Beats Studio Buds, or Beats Fit Pro are lost
We hope this helps.
Cheers!