Trillion Cut London Blue Topaz Stud Earrings in solid sterling silver. Size: 6.4 x 16 mm (0.25 x 0.63 in). Material: Sterling Silver. Total metal weight: 2.0 gr. Trillion cut London blue topaz (6 x 6 mm) = 1.5 ct total for pair. Colour: Blue. Stone cut: Trillion Cut. Occasion: Mother's Day. Anniversary: 4th Anniversary. Birthstone: November.