What does mark DY 750 mean on bracelet?

The mark "DY 750" on a bracelet indicates that the piece is made of 18-karat gold, as "750" signifies that the alloy contains 75% gold content. The "DY" typically refers to the designer or manufacturer, which in this case is likely to be David Yurman, a well-known jewelry brand. This mark ensures authenticity and quality in the jewelry industry.