18th Century Diamond Bow Earrings18th Century Diamond Bow Earrings Iberia, circa 1780. A fine pair of antique earrings with rose cut diamonds set in silver. Well preserved with bright lively diamonds set in closed back settings. The original hook fittings have been replaced with more wearable post backs. 18k gold earring posts and backs. The earrings measure 1. 50 inches in drop length and . 50 inches wide.