This is a standard Mexican-style 925 sterling silver handcrafted vintage ring set with natural lapis lazuli. 925 sterling silver is the industry standard for Mexican-style silver jewelry. Mexico has strict standards for controlling the silver content of silver jewelry. The "925" stamp on the inside of this ring is the standard mark for Mexican handcrafted silver jewelry. The hand-engraved symbols on the ring band—lightning bolts, arrows, crescent moons, and indigenous totems—are the core design elements of Mexican-style silver jewelry, inherited from the cultural symbols of the Aztec and Mayan indigenous peoples of Mexico. These are also the signature features that distinguish Taxco silver jewelry from other silver jewelry, exuding a strong American vintage and Western ethnic style. Classic bezel setting: This lapis lazuli ring uses a full bezel setting, a classic technique for setting natural gemstones in Mexican handcrafted silver jewelry. This not only securely holds the main stone and prevents snagging, making it suitable for everyday wear, but also maximizes the color and texture of the gemstone. This is a classic technique that Taxco silversmiths have inherited for centuries. Wide, flat band: The unisex flat band design balances wearing comfort and visual impact. It's a classic Mexican silver ring style that has been popular since the mid-20th century and can be worn by both men and women. Mark: 925 Ring Size: Hong Kong Size 18 Diameter: 18.5 mm