formula for calculating worth
worth = GP/24*k*w
keys
GP= present gold price in OZ/gm get it from here http://goldprice.org/gold-price.html
K= karats of your gold jewelry
W= weight of your jewelry in OZ/gm
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As price changes every day , worth will also change. So calculate it by yourself.
21 karat gold is 87.5% pure gold.
24 carat gold us the purest gold. 21 carat is the next step down. 24 karat gold is 100% pure. 21 Karat is roughly 6% lower in content. The "impurities though may well be worth more then the Gold itself. Platinum is an impurity that was sometimes used to reduce costs and is now worth more then the gold.
The cost of 1 gram of 21 karat gold will vary depending on the current market price for gold. As of today's rate, multiply the current price per gram of 24 karat gold by the purity percentage of 21 karat gold (87.5%) to get an approximate cost.
Hallmark 875 = 21 karats (karat is a unit of measurement of gold to an alloy - 24 karat is pure gold).
It means that the gold components of that pocket watch are made of 18 karat gold. The max is 24 karat gold (pure gold). Most high end jewelry are made of 18 karat and very rarely 21 karat. There are no 24 karat as they would be at high risk since pure gold is very malleable (can bend easy). Since 18 karat and 21 karat are not 100% pure they are mixed with usually copper for yellow gold or silver if you have white gold.
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these are the proper hallmarks 24 Karat Gold - 24K or 999 22 Karat Gold - 22K or 917 21 Karat Gold - 21K or 875 18 Karat Gold - 18K or 750 14 Karat Gold - 14K or 585 10 Karat Gold - 10K or 417 9 Karat Gold - 9K or 375 14 Karat Gold filled - 14K GF or 14K/20 Sterling Silver - 925 Pure Silver - 999 the ratio is A/24=B for example 10/24=0.417 therefor 10K=417
21 karat gold is still to malleable or too soft to make a practical piece of jewelry as it will bend or break easily. Most necklaces are made of 14k and most rings are made from 10k. Even at 10k, rings still will wear down to the point of breaking on the palm side of the hand.
Different regions of the world produce different finenesses or grades (carats, Karats, or karats) of gold alloy. These vary from 8 karats (33.3% gold content) to 24 karat (99% gold content). The higher the karat, the softer the metal.Typical grades and percentages are below:8-karat (33.3)9-karat (37.5%)10-karat (41.7%)14-karat (58.5%)18-karat (75.0%)19.2-karat (80.0%)21-carat (87.5%)22-karat (91.6%)24-karat (99.0%)
Gold Price Today in Nepal Gold Ounce......................98,418.60Gold Pound......................22,152.10Gram Karat 24..................3,164.59Gram Karat 21..................2,768.46Gram Karat 18..................2,372.68Gram Karat 14..................1,846.50
$21 per ounce
Stamped 55 on gold ring