This is a PGS certified attractive royal blue sapphire weighing 4.05 carats, prong set in the center, with measurements of 12 x 9mm. The gem source is Sri Lanka; its transparency and luster are excellent. Its royal blue color is most sought after. A total of 36 glittering round brilliant cut diamonds adorn the top of this lavish ring prong set in a bursting cluster shape totaling 1.70 carats, displaying E-G color and VS1-SI2 clarity all atop a slim shiny 18 K white gold shank. A PGS certificate accompanies this ring.