Available in .925 sterling silver and 14k gold - measurements available are 3.1 millimeters ( 1.3 millimeters, 1.8 millimeters, 2.2 millimeters. 3.7 millimeters, 4.5 millimeters, 5.5 millimeters, 6.9 millimeters, 7.6 millimeters, 8.9 millimeters, 11 millimeters upon request )