Lady's 18K White Gold Diamond Riviera / Tennis Necklace. Contains: 236 Round Brilliant Cut Natural Diamonds. Weight Approx: 30.00cttw, Color: G-I, Clarity: VS2/SI1. Necklace Length: 32 Inches. Just when you thought that you had everything, this approximately 30cttw 18K White Gold 32-Inch diamond necklace!! YEOW!!! As my wife wore this to an opera a couple of weeks ago and upon our return she told me she had fallen in love. I was a relieved to find out it was the necklace that had her interests, and not some suave young fellow.