It is the center stone that makes this ring. It is almost 1/2 inch across and is an eight-sided fancy cut in tanzanite cubic zirconia in deep purple. How the facets repeat the octagon shape inside the stone cannot be shown easily in the photgraphs, but we are quite sure you have not seen this stone elsewhere at this price. The sides stones are also fancy cuts, but in clear CZ. The center stone is held on four of the sides by double prongs and all stones are hand set. Overall the ring is a great size and has a contemporary look in rhodium plated brass.