Lead can be turned into gold by changing the number of protons in the lead. This is done through physics and it difficult to do. It is not a process that is done by a jeweler but a physicist and can e expensive.
The cost of a gold nugget will (obviously) depend on the amount of gold in it.
liver
it would cost around 1.26 million dollars for that much gold
It cost 5 gold fish.
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A ounce of gold costs 500dollars
One ounce of gold is about 1,100.
$300
$500
$ 330
1107
it cost about £5000 but it can vary