The Camellia Stud measures nearly 1/2 inch in diameter.  This stud was made from a button and the posts were attached with a high quality jewelrs glue. We don't recommend wearing them in the water. They can be cleaned with a mild soap and rinsed with water.  We don't recommend any harsh cleaners even plant based.  They should be thoroughly rinsed and dried with a soft microfiber cloth. but the   I'm a product detail. I'm a great place to add more information about your product such as sizing, material, care and cleaning instructions. This is also a great space to write what makes this product special and how your customers can benefit from this item.