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Message:: [QUOTE="Troodon, post: 218410, member: 4626"]The buffalo is almost pure gold (close enough to qualify as 24k); the eagle is 91.67% gold (rest being silver and copper).  Both coins contain the same net amount of gold, 1 troy ounce.  It's just the buffalo that's pretty much all you're getting, gold and almost nothing else (probably a trace amount of copper), but with the eagle you're getting gold with some silver and copper.  That's how they're both 1 ounce of gold. For an easier illustration, imagine two theoretical gold coins: Coin A weighs 1 ounce and is pure gold.  Coin B weighs 2 ounces and is 50% gold.  The purities are different obviously, but in either case you have the same net amount of gold, one ounce.  That pretty much sums up the difference gold-wise between the buffalo and eagle; they both have the same amount of gold in them, but the buffalo is more pure, the eagle is less pure but weighs more to give the same net amount of gold.  Hope that clears it up.[/QUOTE]