Nothing.
That is, it's not proof of anything. It's trivial to engrave "18K" on a piece of brass and claim that it's 75% gold. In general, you shouldn't assume that any markings on a piece of jewelry have any meaning.
13K is an unusual purity value (they're nearly always even numbers), so I'd suggest that "13" is probably a size, if it means anything at all..
The numbers 1/20 12kg refer to gold in jewelry. The 12 kg reveals that the item is stamped as 12 karat gold, and 1/20 assures that there is 1/20 of gold in the 12 karats.
If you mean dollar you can purchase 0.028 grams of gold for $1
In gold, carats do not refer to a weight or amount of gold, but to what percentage of pure gold is used in a metal alloy. Gold is really soft, so to make durable jewelry from it we add other metals like silver and copper. 24 carat gold is pure, undiluted gold. 12 carat gold is 1/2 gold, 1/2 other metals.
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.
the gold means experienced and the red hash is a pizza stain
This stamp is the quality stamp and represents that the piece is gold plated or better described as gold filled. The 1/20 means that there is a layer of fine gold equal to 1/20th of the jewelry's volume
it mean's that your item is 1/20 percent of 12k gold don't try to turn it in its not valuable at all sorry.
This indicates that the jewelry is 14kt gold filled. Gold filled is similar to gold-plated jewelry, but the amount of gold used with gold filled is usually more and the piece is of higher quality. "14/20" translates to "1/20th of the total weight (5%) is 14kt gold" The other 95% of the jewelry is not gold.
Jewelry engraved with RGP, which stands for Rolled Gold Plating, or plaqué d'or laminé, (proper designation: 1/30 14 kt.), contains approximately 100 times the average amount of gold utilized in gold plating (which is either sprayed or dipped). Rolled Gold Plating involves the lamination of a thin sheet of gold leaf with a lesser metal (usually brass), fused by heating under pressure.
The numbers 1/20 12kg refer to gold in jewelry. The 12 kg reveals that the item is stamped as 12 karat gold, and 1/20 assures that there is 1/20 of gold in the 12 karats.
FOR GOLD & SILVER, INC. The company ceased operations in 1989. See: http://www.yourtrademarkia.com/company-for-gold--silver-inc-457981-page-1-2
GF= stands for "gold filled" Gold Filled (heavy plating), usually has a fraction, For Example:1/20 10K GF found at: http://nitacreations.blogspot.com/2007/10/jewelry-markings-what-do-they-all-mean.html
It would be $24000 because there are 16 ounces in a pound and gold is currently $1500 an ounce. Note that that would be if the jewelry were solid gold, which it isn't - no jewelry is (solid gold is much too soft for jewelry). But if it's 18 carat gold (typical), it would still be 60% of $24,000, which is $14,400 - still a tidy sum.
It means that the Gold on the metal you have is actually Gold Plated. 120 stands for 1/20, which means since it is only a plating, it is only one-twentieth it's weight in actual gold.
It's usually used for Goldrolled items, like Cross Pens, it means V20 = 1/20 of the weight of the item is in Gold.
14/20 gold-filled. Usually found on jewelry to indicate that the piece contains 1/20th (5%) of 14K gold in relation to the base metal core (usually copper or brass).
F stands for filled, so its at least 1/20 18k gold, but 18k is only 75% gold, so theres a very, very, very, very tiny ammount of gold in it