Troy Ounces, Grams, and Tolas: Why Gold Has Its Own Units
If you've ever weighed a banana on a kitchen scale, you used the regular ounce — 28.35 grams. But every gold price you've ever seen quoted online is in a different ounce: the troy ounce, which is 31.1035 grams. That's 10% bigger. Why does gold get its own…