Pure gold and silver have densities of 19,300 kg/m^3 and 10,500 kg/m^3, respectively. If a jeweler uses 0.25 cm^3 of metal to make a ring, then how much heavier (in grams) is the gold ring compared to the silver ring? Please do not just steal the points from this question. If you need points that badly just go through your stream and steal them from the older unanswered questions.