Rosa's heart was racing from the four cups of coffee she had just finished, but she thought she might be having a heart attack.
A carat is a unit of weight for diamonds and other gemstones. One carat equals 200 milligrams (0.200 grams). There are 453 grams in a pound (1,000 grams to a kilogram). Therefore, if your fiancee weighs 170 pounds, you have a 385,050-carat fiancee! A karat, when used with gold, is a unit of purity-- 24-karat gold is pure gold, but usually you mix gold with a metal like copper or silver to make jewelry (because pure gold is too soft). Each karat indicates 1/24th of the whole.
That leaves just under 24 grams of gold to each person on planet earth, or .76 troy ounces or .83 ordinary ounces per person. In an ordinary male gold wedding band at 18-karat purity, there are about 5 grams of pure gold. That means every person on planet earth could own about 5 gold rings.