Sterling Silver Snowflake Necklace Set Round Rub Set Cubic Zirconia. Stones 15 X 22 mm in diameter Set With 1.75 mm , 2.5 mm and 3 mm Stones. Comes on a 16-18 Inch Adjustable Chain. The Finest ‘AAA’ Cubic Zirconia Stones. 925 Sterling Silver-Tarnish Free.