Antique Victorian 14K Gold .50 CT Old Mine Cut Diamond Engagement Ring - Size 7

Dating to the late 1890s or so, may I offer this 14K Yellow Gold (tested) engagement ring featuring an Old Cut Mine Diamond as the center stone. Measuring 5mm and a bit. estimated weight is .50CT Plus. Grading is SI with color of H-I. Ring size is 7 on my sizer; weight is 3.3 grams. While there is no gold mark present on the inside shank, there is a makers mark but it is now too faded to make out. Lovely design that displays the stone well.