You are asking the wrong question. .999 gold would be 24 carat.
If you have 22 carat or 18 carat or 14 and 10 carot gold and it weighs a gram, it does not contain a gram of gold.
There are some 1 gram size gold ingots which can be bought in .999
There are some 1 gram size gold ingots which can be bought in .95 gold
Most U.S. gold coins are minted in .95 and are not pure gold.
Canadian Maple leaf coins are .999 pure gold. Pure gold is considered to be to soft for coinage.
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