Retro Filigree Transitional Cut Diamond Engagement Ring in 14kRetro Filigree Transitional Cut Diamond Engagement Ring in 14k. This amazing Retro filigree ring features a . 56 carat transitional cut set in 14 karat white and yellow gold. The diamond is prong set in a hexagonal mounting of white gold, with more white gold running down the beautiful filigree work in the shoulders. The shank is yellow gold and splits to contain the delicate wire work enveloping the basket.