![Arts & Crafts Diamond Ring with an Oxide Finish. Arts & Crafts Diamond Ring with an Oxide Finish.](https://www.langantiques.com/university/wp-content/uploads/elementor/thumbs/Arts__Crafts_Diamond_Ring-q88jzy3z3yls6d52153arjcfirj3d4wvc5bzidm8aw.jpg)
An oxide finish is accomplished when a black finish is applied to metal. Sometimes the entire surface is coated and, for a different effect, the high areas are rubbed off leaving the oxidation in the engraving or embossing. This can be achieved by using a liver of sulfur or platinum chloride dip.