Simple and elegant. This shimmering solitaire ring features a cushion-cut simulated tanzanite, constructed from lab grown corundum, to provide the finest quality and beauty and Lafonn's signature Lassaire simulated diamonds. The ring is in sterling silver bonded with platinum. Simulated tanzanites that are constructed from lab-grown corundum have the finest quality and beauty as natural tanzanites. We make every effort to keep our simulated tanzanite stone colors consistent. However, since they are constructed from lab-grown corundum, our simulated tanzanites may not be exactly as shown on the website. Stones may appear lighter, darker or have natural variations.