Designer Diamond Necklace 2 Prong Setting. The Semi Diamond Necklace comes with a quantity of 52 - 60 Diamonds Depending on the carat weight you choose. The Necklace length is 16". the diamond quality is F-G SI1. The Photo Shown is 5ctw. All of the Diamonds are custom cut by Mike Nekta to ensure maximum brilliance and light reflections from all angles.