AA Grade London Blue Topaz and Sterling Silver stud earrings. London Blue Topaz is one of the most popular topaz gemstones, London-blue topaz is a medium-to-deep grayish blue, sometimes with a green tinge sparkling in hues of the ocean depths. The stone is naturally flawless in most cases. These earrings are hand set by Pamynthia Designs with 4mm round faceted AA Grade London Blue Topaz stones, (1/4 carat each for those wanting a carat reference for diameter comparison) and 925 sterling post settings and ear nuts. These earrings go with everything, from blue jeans to the ballroom. They look great worn alone, mixed with other sizes for those having multiple piercings and also work great with our sterling silver earring j-style jackets.