Federica Rettore’s tanzanite drop earrings have the most brilliant coloring and remarkably intricate design that no other fashion accessory can compare. 2” X 1” Post. 18K Rose Gold. Brilliant Cut Diamond. 0.20 CTW. Brown Diamonds – 0.29 CTW. Tanzanite – 6.85 CTW. Bi-Color Tanzanite Drops – 68.75 CTW. Available in Rose Gold.