What is another word for "carat"?

Roget's Thesaurus (1911) lists these synonyms for "carat": analytical, arroba, avoirdupois, baby, balance, ballast, beam, burden, burdensome, burthen, centigram, counterpoise, cumber, cumbersome, cumbrous, drachma, grain, gram, gravitate, gravitation, gravity, heaviness, heavy, hundredweight, incumbent, kilogram, lead, load, long, lump, lumpish, lumpy, mass, massive, metric, milligram, millstone, mountain, ounce, pennyweight.