Modern Right Hand Ring 2.56 Oval Cut Halo Tanzanite & Micro Pave Round Diamonds in PlatinumModern Right Hand Ring 2. 56 Oval Cut Halo Tanzanite Micro Pave Round Diamonds in Platinum. This lovely modern tanzanite ring features a bright blue oval cut tanzanite at 2. 56 carats set in platinum. This fine quality tanzanite is rich in color and vibrant in clarity. The tanzanite is accented with a round diamond set halo bezel adding additional brilliance to the ring. There are also round brilliant diamonds set into the double band shank.