Sterling Silver Swiss Blue Topaz Butterfly Pendant-Necklace 18" 1/2ct tw of Blue Topaz .925 Sterling Silver Pendant and 18 inch chain. Marquise and Round Swiss Blue Topaz December Birthstone Sterling Silver is Rhodium Finished 1/2ct tw of Blue Topaz .925 Sterling Silver Pendant and 18 inch chain. Marquise and Round Swiss Blue Topaz December Birthstone Sterling Silver is Rhodium Finished