1Princess Halo Mounting with Split Shank, 6.0 mm center 20 Sep 2016 /0 Comments/in Bridal, For Diamonds, For Gemstones, Halo, Rings Fixed Triple Key 14k white gold Princess Halo Mounting with Split Shank, Holds 6.0 mm center. Prong set with round brilliant cut diamonds. Total mounting weight is .37cts.