Simon G. Oval Cut Paraiba Tourmaline Halo Diamond "Flower" RingIf you are looking for a piece that truly stops traffic, this Simon G. Paraiba Tourmaline Flower Ring is exactly what your jewelry box has been missing. The center of attention is a massive oval cut Paraiba tourmaline, featuring 4. 52 Carats of Paraiba Tourmaline and 0. 90 Carats of Round Cut White Diamonds, a gemstone so rare and vibrant it looks like it was plucked straight from a tropical lagoon. What we love about the MR2867 is that Simon G.