I used a piece of Abalone (12mm x 10mm) at the top that has tons of bright swirling color. Paired with an Opal (14mm x 10mm) that has bright multi colored fire. Both are bezel set in fine silver .999 to my hammered and shaped adjustable sterling silver swirl band. Total length of design is just over 1 3/8" and size is 8, but is adjustable up or down about 1- 1 1/2 sizes. Thanks for looking! ****Insurance and tracking included on purchases over $100 shipped within the United States.