Size... Finger circumference (inner diameter x 3.14) Size 13 (inner diameter 1.72 cm) Size 15.5 (inner diameter 1.79 cm) Size 18 (inner diameter 1.89 cm) Light blue zircon... 1.5 cm long including the frame, 1.1 cm wide Cubic Zirconia Copper with 925 silver plating (with stamp) I also have other items on sale at great prices. You can get 100 yen off each item from the second item purchased. Items under 500 yen are discounted by 50 yen.