Oval Turquoise Cocktail Ring. • Metal Type: Sterling Silver. • Metal Stamp or Hallmark: .925 • Metal Purity: 92.5% Sterling. • Gemstone: Turquoise. • Gemstone Creation Method: Simulated. • Face Measurements From South To North: 20.7mm(0.81inch). • Ring Design: Oval Turquoise Cocktail Ring.