Ladies 18kt custom made white gold blue Sapphire diamond ring. Four prong set with 1 cushion step natural NO Heat blue Sapphire weighing 17.39 cts with origin Sri Lanka. Measurement: 13.21 x 12.34 x 10.56 mm. This Sapphire is graded by the Gemological Institute of America with certificate number 6232479375. The halo around the Sapphire is common prong set with 18 – 2.7 mm round brilliant cut diamonds weighing approximately 1.44 cts with clarity and color approximately SI1, G. Total diamond and carat weight is approximately 2.88 cts. This ring is high polish.