What TW stamped in a ring does mean?

The "TW" stamp in a ring typically stands for "Tiffany & Co." and indicates that the piece is made by or associated with the renowned jewelry brand. It may also refer to a specific designer or artisan whose initials are "TW." In some contexts, it could denote the quality or type of metal used, but it's most commonly linked to Tiffany. Always verify with a reputable source or jeweler for accurate identification.