So much sparkle. AAA grade Swiss Blue Topaz and sterling silver stud earrings. These highly faceted bezel set Swiss Blue Topaz gemstones measure 4mm. The circular silver bezel adds 2mm to the size for a total diameter of 6mm. The silver has been touched with just a hint of rhodium to protect and prolong them from the tarnishing process. Swiss Blue Topaz is known for its electric sky blue coloring.