Abrasha wrote in message
. ..
snip

Having said that, AFAIK, there is no such thing as a 24K gold coin. Coins are
usually made out of "coin gold", which is usually something around 900/1000
gold. However, if in fact you have gold coins, and not ingots, you may want to
find out what their alloys are, before you start adding them to your 14K gold
alloys.

Abrasha
http://www.abrasha.com

Abrasha:

Gold coins, especially so-called "bullion coins", which are issued
primarily for purchase for their intrinsic metal value, rather than
for commerce or collectors, can indeed be 24K gold. Common examples
include the Canadian Maple Leaf, Chinese Panda, and Australian
Kangaroo coins. All of these are fine gold. A one ounce Maple weighs
exactly one troy ounce, and contains one troy ounce of fine gold.
Others, such as the US Eagle or Krugerrand, are alloyed, typically as
you say to about .900 fine (22KT +/-). A "one ounce" Krugerrand
weighs more than one troy ounce, though it does contain one ounce of
gold. The rest is copper. There are a few oddball alloys out there,
as well in lesser known coin editions.

You are, of course, correct that the poster needs to know what alloy
he actually has.

Regards,

Bob