The 7 symbols of joy bar choker necklace. This magnificent adjustable choker necklace features alternating fancy lab-grown blue sapphires and Lafonn's signature Lassaire simulated diamonds in sterling silver bonded with platinum. May the 7 Symbols of Joy bring you Longevity, Health, Love, Happiness, Peace, Prosperity and Friendship. Lab-grown sapphires have the exact same chemical, mineral, and optical properties as natural sapphires which vary in color, texture and pattern.