We start with a conversion scale of 3.5 grams to an eighth. That makes it easy to solve, how many grams in an ounce? If an ounce is eight eighths, that’s 3.5 grams x 8, or 28 grams in an ounce ...

A troy ounce is a unit of measurement for precious metal weight that dates to the Middle Ages. One troy ounce is equal to 31.10 grams.

One troy ounce is equal to 31.1034768 grams, and 12 troy ounces make up one troy pound. Instead of oz, which represents the avoirdupois ounces, the abbreviation for a troy ounce is ozt.