Cushion Cut Alexandrite Square Halo Pendant Necklace in solid sterling silver. Size: 12.7 x 19.1 mm (0.5 x 0.75 in). Material: Sterling Silver. Total metal weight: 8.02 gr. Cushion cut alexandrite (10 x 10 mm, grade AAA) = 6 ct total. Colour: Colour Changing. Stone cut: Cushion Cut. Anniversary: 55th Anniversary. Birthstone: June.