𝐈𝐭𝐞𝐦 𝐒𝐩𝐞𝐜𝐢𝐟𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬: • Metal Type: Sterling Silver. • Metal Stamp or Hallmark: .925 • Metal Purity: 92.5% Sterling. • Gemstone Creation Method: Lab Created. • Gemstone: Lab Created Blue Opal • Face Measurements From South To North: 6mm (0.23").