The modern Silver Eagle bullion coin weighs 1 ounce.
A modern Gold Eagle bullion coin is 1/10th of an ounce, the older Liberty Head series coins weigh 8.359 grams.... so a $5 gold coin does not weigh an ounce to start with.
The American Eagle
The $20 gold piece called (Double Eagle) weighs about an ounce.
It is an American Eagle gold coin, not a double eagle coin, it contains 1 ounce of pure gold, its value depends on the spot price of gold for example, today it would be worth just a bit less than $1,300. However, tomorrow it could be worth a lot more or a lot less, it just is dependent on the price of gold.
It's a 2000 one-ounce Silver Eagle bullion coin and as of today is about $18.00
"An eagle is a $10 coin. Assuming you are referring to the $5 coin, these weighed about 8.25 gm. For comparison purposes, a modern Sacajawea or Presidential dollar coin weighs 8.1 gm."[Improvement - more specific answer]Sorry but I think the poster was probably asking about a modern $5 face value Gold Eagle bullion coin which contains 1/10th Troy ounce( or about 3.11 grams) of gold.The US Mint produces the "Eagles" in 4 different weights1/10th oz American Eagle ($5 face value) coin - 16.5mm in diameter1/4th oz American Eagle ($10 face value) coin - 22mm in diameter1/2 ounce American Eagle ($25 face value) coin - 27mm in diameter1 ounce American Eagle ($50 face value) coin - 32.7mm in diameter
A 1908 twenty dollar gold coin, also known as a Double Eagle, weighs approximately 33.436 grams or 1.075 troy ounces.
There were no double eagle coins minted in 1816.
The coin has 3.1103 grams of pure gold in it or 1/10th of an Troy ounce.
A $5 American Gold Eagle bullion coin is 1/10th of an ounce of pure gold. The New-York market closed at $1691.60 per ounce, so the coin is worth about $169.16.
A 2007-W Silver Eagle is one Troy ounce of pure silver.