Diamond Heart & Ribbon Pendant Necklace 0.1 carat in solid 9ct gold. Size: 16 x 16 mm (0.63 x 0.63 in). Material: Gold. Total metal weight: 3.32 gr. Round brilliant cut diamond (1 x 1 mm, J colour, I1 clarity) = 0.1 ct total. Colour: Clear. Diamond colour: J. Stone cut: Round Cut. Anniversary: 10th Anniversary, 60th Anniversary. Birthstone: April.