Our adjustable rings are made with stainless steel in gold, silver, or rose gold tones. The inside tray diameter is 3/8” (9mm) or 1/2” (12mm). These fit most women’s sizes and smaller men’s sizes. I am happy to customize the tray contents for you; just let me know what you’d like. This ring: Metal color: gold Tray diameter: 1/2” Tray contents: Blue & green real abalone