We use 925 sterling sliver. DNA keepsakes require you to be mindful of how you care for them they are one of a kind and should be treated like a valuable hairloom please keep in mind for all color plated products they need your special care. The color can tarnish depending on how you use it. Especially for yellow gold and rose gold plated products,the color could tarnish If you don't take them off when shower,swimming or washing your hands. If you care about tarnishing,please order the original color of the material like silver it can get oxidized but can be shiny after polishing.