Victorian era sapphire and diamond three stone ring

Victorian era sapphire and diamond three stone ring, in 18k gold.  Sapphire weighs approximately, .70 carats, GIA certified #2225922770, Cambodian origin, with no heat treatment. Flanked by two old mine cut diamonds. English in origin. Circa 1880. 

Old mine cut diamonds were cut for gas and candle light and omit a darker romantic sparkle. While the precision faceting of modern stone’s main objective is to refract as much white light as possible.  A 19th century diamond was cut to preserve as much weight as possible and often follow the same shape as the rough diamond crystal as it was pulled from the ground.

Size 5.75, can be resized.