Illuminate your look with this charming blue lab-created sapphire and diamond "y" necklace. 10k white gold. 5. 0 x 4. 0mm oval-shaped blue lab-created sapphires alternate with quartets of diamonds along the center. The blue lab-created sapphire drop glistens in a sunburst frame of diamonds. 1/4 ct. T. W. Of diamonds. 17. 0-inch cable chain necklace with lobster claw clasp.