TWO ANTIQUE OLD MINE CUT DIAMONDS RINGS. One, yellow gold and silver with pair twin old mine cut diamonds each weighing approx. .30-.35 ct. with ten smaller diamond accents, ring size: 4 3/4. Other, fancy brown old mine cut diamond weighing approx. .40-.45 ct. in 14k (585) white gold geometric setting with six white diamond accents, ring size: 5. Estimate $400-600