Graduating sizes of blue lab-created sapphires are topped with sparkling lab-grown diamonds in this elevated chevron bar necklace. Sterling silver 2. 1mm to 3. 4mm blue lab-created sapphires lab-grown diamonds; f colour/vs2 clarity 1/6 ct. T. W. Of lab-grown diamonds 16. 0- to 18. 0-inch adjustable cable chain; lobster claw clasp sapphire is the traditional birthstone for september