 Only during the sole rule of Constantine VIII () did the two coins become iconographically distinct as well.By the mid-11th century, the "tetarteron" measured 18 mm wide and its weight apparently standardized at 3.98 grams, i.e.three carats less than the "histamenon" or "stamenon" (a name first attested in 1030), which now measured 25 mm in diameter (as opposed to 20 mm for the original "solidus").