Early 20th Century Old Mine Cut Diamond EarringsEarly 20th century platinum earrings. Center old mine cut diamond stones are approximately 1. 75 carats each, I J color, I1 and SI2. The top two old European cut diamonds are approximately . 35 carats each. The earrings are approximately 4. 20 carats in total diamond weight. Circa 1910. Old mine cut diamonds were cut for gas and candle light and omit a darker romantic sparkle. While the precision faceting of modern stones main objective is to refract