I think you mean a "Clipped Planchet" coin. All error coins need to be seen. Take to a collector or coin dealer for an idea of value.
Quarter-cut diamond may be a pattern description. Diamond stones are not usually described as 'quarter-cut'.
The value of a diamond depends on its cut, colour, carat weight and its clarity. A local jeweler can answer your question.
The value of anything is what someone will give you for it. You can buy a ~.75 carat diamond today on Blue Nile and spend between US$1,570 and US$4,256, depending on the cut, clarity and colour -- and cut, that you want.
There are a few explanations (if this truly is a mint error) The first and most valuable would be a quarter struck on a nickel blank, such a coin would be worth quite a bit of money. The second most valuable would be a coin that was a clipped planchet (blank) such a coin has a cut on it, but as this can be done after minting so it is best to see a coin dealer about this. But, it is always possible this wasn't done at the mint, but was done afterwards. So you need to see a reputable coin dealer to get it evaluated in person.
You can buy Copenhagen Long Cut Mint at HH-Distributors LLC in Ohio.
with a quarter stick
The value of a diamond depends on its cut, its clarity, its colour and its carat weight. A local jeweler can give you the answer you want.
grizzly mint long cut
September 4, 2009 What you have is known as a "clipped planchet". It occurs when the machine used to punch out blanks [planchets] overlaps a previous cut. The value for this type of error varies greatly from about $3 to $75 depending upon the amount of the coin missing.
The value of a diamond depends on its cut, its clarity, its colour and its carat weight. A local jeweler can give you the answer you want.
Cut it into 4 pieces the long way.
The coin called a quarter is called a quarter because its value is a quarter of a dollar (25 cents times 4 equals 100 cents) The quarter denomination is the only one that doesn't fit into a decimal (10-based) coinage system. Most other countries have 20-cent pieces instead of 25, because 1/5 of a dollar follows the pattern of the factors of ten: 1, 2, and 5. But when the US first started minting coins the former colonies were also using a Spanish coin called a "milled dollar". It was large and had no smaller denominations, so to make change it was actually cut into pieces (!). Cutting it into 1/5 would be difficult, so people cut it into halves, quarters, and eighths. To simplify change-making using the new US coins, the Mint decided to make coins worth a quarter of a dollar so they'd match the cut-up pieces of a Spanish milled dollar. By the time the milled dollar was removed from circulation, people had become used to using 25 cent coins instead of 20 cent coins, and the denomination has stayed with us ever since.