SIZE 7. Rhodium ring with 20- 1.5x2mm baguette white CZ's & 36- 1.4mm round white CZ'sBlue Luster is our line of Brass based jewelry. Each piece is plated with Genuine Rhodium (one of the strongest and most valuable precious metals on earth) and 18 Karat Gold with hand set top quality Cubic Zirconia stones.