What does 925 D m on mens ring?

The marking "925 D" on a men's ring indicates that the ring is made of sterling silver, which is composed of 92.5% silver and 7.5% other metals, typically copper. The "D" could refer to a specific design or brand, but it's not a standard designation. This quality stamp assures buyers of the ring's silver content and authenticity. Always check for additional markings to confirm the manufacturer's identity or other characteristics.