Earrings by John Field These asymmetrical, swirl ear studs are made from sterling silver and feature a wonderful, 6mm lab. grown blue opal triplet gemstone on one ear stud and a decorative brass swirl on the other and they measure 13mm in diameter. We design our own stencils, which are embossed onto the 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 a choice of gemstones with these ear studs to choose your favourite stone please use the 'Finish' drop-down menu. Features Primary Material : silver Other Materials : blue opal and brass Fitting Type : Post Dimensions (mm) : 13x13x2 One of a Kind : No Metal : silver Gems : blue opal triplet Hallmarked : No Wire Material : sterling silver Cleaning InstructionsThese ear studs have been finished with a clear, protective, anti-tarnish coating.