Details: Biwa pearl: approx. 22mm x 5mm. Blue topaz: 12mm x 10mm amethyst oval: 11mm x 9mm. Adjustable 5mm ring shank. Due to the one-of-a-kind nature of the biwa pearl, the color and shape pattern may vary slightly from the image shown. Handcrafted in .950 sterling silver by artisans in Mexico. All charles albert pieces are signed/hallmarked.