This CZ simulated diamond tennis necklace is a traditional, elegant design sizzling with sparkling crystals for an unforgettable effect! This is one you'll reach for over and over again, knowing that each time you wear it, you'll look fabulous! Sterling Silver (925). Cubic Zirconia Diamonds. Length: 12 inches + 4 Inches extension. E-Coating Protection (Anti-Tarnish).