Featuring an Old Mine cut diamond weighing app. 1.05ct (Round-Cornered Square Brilliant, K color, SI1 clarity) in an eight prong buttercup setting with black enamel* engraved details on shoulders, fashioned in 18k. Circa 1890. Size 6.75*Although vitreous enamel forms a hard, durable surface, it is susceptible to chipping and breaking upon impact.**Some enamel missing.