Earrings by John & Dawn Field These domed ear studs are made from sterling silver and they measure 16mm in diameter. Two of the images show the ear studs featuring two of our wonderful, lab. grown, blue opal triplets and the other image shows the ear studs set with two green spinel stones. We emboss the pattern into the silver by hand, so each pair will vary slightly. The ear posts and backs are made from sterling silver.We offer a choice of eleven different gemstone to choose from, which are, Amber, Amethyst, Pink corundum, Garnet, Lapis lazuli, White moonstone, Blue spinel, Green spinel, Red and Blue lab. grown opal triplets, Turquoise. Please choose your favourite stone from the 'Finish' drop-down menu. Features Primary Material : sterling silver Other Materials : brass and man-made opal triplet Fitting Type : Post Dimensions (mm) : 16 diameter One of a Kind : No Metal : sterling silver Gems : man-made opal triplet Hallmarked : No Wire Material : sterling silver Cleaning InstructionsThese ear studs have been finished with a clear, protective, anti-tarnish coating..