'Troy Ounce' and 'Ounce' (toz & oz) Convertor

t oz:

A troy ounce (t oz) or (toz) is a unit of measure used for weighing precious metals that dates back to the Middle Ages.

Originally used in Troyes, France, one troy ounce is equal to 31.21 grams, according to the U.K. Royal Mint.

oz:

An ounce is a unit of weight used in Britain and the USA. There are sixteen ounces in a pound and one ounce is equal to 28.35 grams.

By the way, this app is useful for converting amounts from Ounce to Troy Ounce and vise verse.