This sapphire and diamond halo ring is made of 18k white gold and weighs 4.2 DWT (approx. 6.53 grams). It contains a top quality GRS certified (GemResearch SwissLab) natural Ceylon sapphire in a royal blue color weighing 5.71 carats, adorned by 40 round cut diamonds G color, VS2-SI1 clarity weighing 0.63 CTTW.