The gram, symbol g, is a unit of mass.
Originally defined as “the absolute weight of a volume of pure water equal to the cube of the hundredth part of a metre, and at the temperature of melting ice”, a gram is now defined as one one-thousandth of the SI base unit, the kilogram.
31.1034768 grams = 1 troy ounce
The troy ounce (ozt) is a unit of imperial measure. In the present day it is most commonly used to gauge the weight and therefore the price of precious metals.
The troy ounce is part of the troy weights system derived from the Roman monetary system which used bronze bars of varying weights as currency.
32.1507466 troy oz = 1 kg
1 troy ounce = 31.1034768 grams
1 troy oz = 1.09714 avoirdupois ounces (commonly understood as ‘ounce’)