1853 $0.50 gold coin? Can't seem to find this coin in reference material?

I took a call over the weekend that someone was looking for information on a coin he has. I haven't seen it. However, he described it to me as being a gold coin, dated 1853, that says half dollar on it and also California. He says it is pretty small, about the size of your pinky fingernail.
I can't find this in my reference book. Does anyone have info on this? Or does this even make sense? If possible, how about a picture.
The reason he called is he was saying he has a small jar with a few coins in it. Some wheat pennies, a few morgan dollars (common dates) and this one coin referenced above that is in a plastic holder. He wants to know if it is valuable, as he is thinking of making it into a jewerly piece for his daughter.
Thanks!
I can't find this in my reference book. Does anyone have info on this? Or does this even make sense? If possible, how about a picture.
The reason he called is he was saying he has a small jar with a few coins in it. Some wheat pennies, a few morgan dollars (common dates) and this one coin referenced above that is in a plastic holder. He wants to know if it is valuable, as he is thinking of making it into a jewerly piece for his daughter.
Thanks!
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Comments
Doggedly collecting coins of the Central American Republic.
Visit the Society of US Pattern Collectors at USPatterns.com.
It doesn't have an explicit denomination, it's almost certainly fake. That is, "1/2 dollar" might be real, but "1/2 gold" is probably not.
If it has a bear on the reverse, it's almost certainly fake.
Some fakes have a little bit of value, but in the few tens of dollars. Check eBay.
Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire