What does the stamp SB14K mean on a white gold diamond?

The stamp "SB14K" on a white gold diamond indicates that the piece is made of 14-karat white gold, which contains 58.3% gold mixed with other metals, such as palladium or nickel, to achieve its color and strength. The "SB" could refer to the manufacturer or designer's mark, though it is not a standard industry designation. Always ensure to verify the authenticity with a professional jeweler when purchasing jewelry with such markings.