Montana Yogo sapphire rose ring 3.25mm (.20 ct) Head of rose on 3.25mm ring is 1/4″ Set in 925 sterling silver. Yogo sapphires are rare and always natural in color, no heat treatment. Yogo sapphires come with certificate of authenticity and come in a quality gift box. Available in sizes 4, 5, 6, 7, 7.5 & 8