This stunning engagement ring features a yellow gold band with white gold around the 3 diamonds. There are Celtic Knots on both sides of the diamond set. This ring measures approximately 5.1mm wide at the top (.2 inches) and 2.8mm at the bottom (.11 inches). The diamonds include two 0.25 carat diamonds on the ends and one 0.5 carat diamond in the center. This ring was Made in Ireland by Boru Jewelry and comes in a lovely gift box. Standard Size 3 = UK/Aust. Size F. Standard Size 4 = UK/Aust. Size H. Standard Size 5 = UK/Aust. Size J. Standard Size 6 = UK/Aust. Size L 1/2. Standard Size 7 = UK/Aust. Size N. Standard Size 8 = UK/Aust. Size P. Standard Size 9 = UK/Aust. Size R 1/2. Standard Size 10 = UK/Aust. Size T. Standard Size 11 = UK/Aust. Size V. Standard Size 12 = UK/Aust. Size X. Standard Size 13 is between a UK/Aust. Size Z 1/2 and Z1.