400 to 500 is all the gold is in place. J
The Halfcrown is a silver coin. If you have a gold coin it is because somebody plated it. Modified coins have no collector value.
The 1950 British Halfcrown was struck in a copper nickel alloy. If you have a gold Halfcrown coin, it would be because somebody has gold plated it, perhaps to commemorate the birth of a baby in the family, or some other significant family occasion. Modified coins have no collector value.
18k gold plated jewelry is not worth much based on the gold amount. However, it could have design or sentimental value and be worth something to you.
24kgp means that the piece is 24 karat gold plated. A gold plated piece is worth much less than a piece that is 24 karat gold.
It is only gold plated. Since it is gold plated it is an altered coin and is worth 50 cents.
Since it is gold plated it is considered an altered coin and is worth face value.
$1. It's been gold plated, not struck in gold.
YES!
10 dollars
10,000dollers
Not gold and not plated. It's made of manganese brass. (And yes, it's worth something: it's worth one dollar.)