4 Ct. Halo Blue Sapphire Ring 4.37 Carat Oval Blue Sapphire with 2.16 Carats Oval Diamonds set in Platinum. $40,000 Default Title - $40,000 Quantity Add to Cart Book Appointment This product is currently sold out. Please fill in the form below if you'd like to be notified when it becomes available. 4.37 Carat Oval Blue Sapphire with 2.16 Carats Oval Diamonds set in Platinum.