Google has introduced a 'refinement' feature to Gmail, aimed at enhancing email quality and ensuring more appropriate expression. This feature is implemented through the Gemini writing tool, allowing users to choose options like 'Formalize', 'Expand', or 'Refine' under the 'Help Me Write' section to optimize email content. The AI writing tool is more intuitive and user-friendly on Android and iOS devices. Users with a Google One AI Premium account or Gmail Workspace can enjoy this feature for quick optimization of new drafts.