One-of-a-kind 18k white gold hinged rock crystal cuff with an oval cabochon certified Colombian emerald, surrounded by 10 old mine-cut diamonds with 10 tiny rose-cut diamonds, circa 1860. Formerly the property of Marie de Caters, nee Lablache, a well-known mezzo-Soprano, whose father was the Great Lablache, who sang for the Tsar, at Beethoven’s funeral, as well as was the Royal music tutor to Queen Victoria.