Brooches Jewels : Victorian Demantoid Garnet Diamond Crescent Brooch. Victorian Dementoid Garnet a… 19 September 2018 3130 Brooches Jewels : Victorian Demantoid Garnet Diamond Crescent Brooch. Victorian Dementoid Garnet and Diamond Crescent Brooch Extremely Rare Sizeable Demantoid Garnets Removable Old Mine Cut Diamond Crown English Circa 1880