How many grams are there in an ounce?  What is a gram?
 

The gram is a unit of mass who's symbol is g.

In all the systems, the fundamental unit is the pound, and all other units are defined as fractions or multiples of it.

A possible source of confusion is that gold is often priced on the open market in the more traditional troy ounce
(one troy ounce is exactly 31.1034768 grams, which is larger than the avoirdupois ounce which has a mass of 28.35 grams).

A gold gram is the amount of value represented by exactly one gram of gold.

It is a unit of account frequently used for digital gold currencies.

It is denoted by the symbol "gg", "AUG", or "GAU".

A milligram of gold is sometimes referred to as a mil or mgg.

Therefore, 1 AUG = 1 gg = 1000 mgg = 1000 mil, and 1 mil = 1 mgg = 0.001 gg = 0.001 AUG.

This allows gold holdings and transfers to take place in tiny fractions of a gram (equivalent to a few pence)

1 ounce (avoirdupois) = 28.349523125 grams

1 ounce (troy) = 31.1034768 grams

Which really still doesn't answer the question which is why we clearly display todays scrap gold prices clearly in grams.