.9999 is 10 times purer (10 times less impurities).
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Gold that is stamped with ".9999" refers to the purity of gold. This particular number indicates that the piece is 99.99 percent pure gold.
$125 if worn, up to $190 in Extremely Fine condition
If the coin is dated between 1840-1907 there is .12094oz pure gold in the coin.
18 karat = 75.0% gold14 karat = 58.3% goldPure gold is too soft to withstand the stresses of every-day wear, so it is alloyed with a mixture of metals like silver, copper, nickel, and zinc to give it strength and durability. Karatage, noted by a number followed by "k" indicates purity, or how much of the metal in a piece of jewelry is gold. Karatage is expressed in 24ths, making 24k gold 100% gold
The carat or karat (US) refers to the purity of gold. 24 kt is 100% gold, but is too soft to be made into jewelry that will last. 18 kt is (18/24) or 75% gold and 25% other metals. 14 karat is 14/24 (about 58 %) gold, and about 42 % other metals. Having the other metals, gives gold jewelry its durability as well as color, depending on what is chosen for the other metals. Carats for diamonds refer to the weight of the diamond. 1 ct is 200 milligrams or 1/142 ounce.