Earrings by John Field These asymmetrical, swirl ear studs are made from sterling silver with brass decoration and a choice of gemstone, they measure 13mm in diameter. We design our own stencils, which are embossed onto the sterling silver to create an interesting surface pattern and because they are handmade the pattern will vary with each pair. The ear posts and backs are made from sterling silver.We offer eleven different gemstones which are, Amber, Amethyst, Pink corundum, Garnet, Lapis lazuli, White moonstone, Blue spinel, Green spinel, Red and Blue lab. grown opal triplets, Turquoise. To choose your favourite stone please use the 'Finish' drop-down menu. Features Primary Material : silver Other Materials : brass and opal Fitting Type : Post Dimensions (mm) : 13x13x2 One of a Kind : No Metal : silver Gems : opal triplet Hallmarked : No Wire Material : sterling silver Cleaning InstructionsThese ear studs have been finished with a clear, protective, anti-tarnish coating.