MELLERIO - 1880S DIAMOND STAR BROOCH This brooch is in the shape of an eight-pointed star. The centre and ends are set with old-cut diamonds. Mounted in 18K yellow gold. Signed Mellerio and numbered, hallmark of Mellerio dits Meller. Gross weight: 14.12 g. Diameter: 5.2 cm. Diamond weight: approx. 2.80 carats. A diamond and 18K yellow gold star brooch by Mellerio, circa 1880. Signed Mellerio and numbered, Mellerio maker's mark. Gross weight : 14,12 gr. Diameter : 5,2 cm. Diamond weight : 2,80 carats approx.