This precious collection cushion cut blue sapphire opera necklace is gorgeous for any get up. Engineered with 23 round diamonds weighing 5. 41 carats, and 23 cushion cut blue sapphires with a total weight of 19. 18 carats in a glittering design. Additional Information: 23 round diamonds weighing 5. 41 carats, and 23 cushion cut blue sapphires with a total weight of 19. 18 carats.