Lab Grown Diamond Tennis Necklace: Features round 2.50 mm lab-grown diamonds in a classic tennis necklace design. Total carat weights 10 cttw for a look that's timeless and radiant. Chain Lengths: 16" to suit your preferred fit and layering style. Expertly crafted in high-quality 925 sterling silver for a bright, polished finish that complements the brilliance of the diamonds.