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10K Gold Purity

What 10K gold means: 41.67% gold, stamped 417, with the pure gold weight per tola and per troy ounce.

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In short 10K gold is 10 parts gold in 24, which works out to 416.67 parts per thousand and 41.67% gold by weight; the remaining 58.33% is alloy, usually copper, silver, zinc or nickel, and it is what sets the colour and the hardness. It is stamped 417. The mark, 417, sits ABOVE the arithmetic figure of 416.67. This is the only standard mark that does, so an alloy that is exactly 10 karat is not entitled to the stamp and has to be made slightly richer to earn it. In practical weights, one tola of 10K — 11.6638 grams gross — contains 4.860 grams of pure gold, and one troy ounce of it contains 12.960 grams; gold is priced per troy ounce of 31.1035 grams, never per the 28.35 gram ounce on a kitchen scale. This is the standard in United States, where it is used for budget jewellery; the US legal floor. One thing to keep straight: karat is a ratio out of 24 and says nothing whatever about weight, while the carat that gemstones are sold in is a mass unit of exactly 0.2 grams. A two carat stone weighs 0.4 grams; a 10 karat piece can weigh anything at all.

How to use the 10K Gold Purity

  1. Read the fineness and percentage for 10K.
  2. Check the pure gold weight per tola and per troy ounce.
  3. Switch the selector to compare with another karat.

About the 10K Gold Purity

What 10K gold means in fineness, percentage and pure gold weight, and where it is the standard.

What people use it for

  • Reading a 417 hallmark and knowing what it guarantees.
  • Working out the gold content of a 10K piece.
  • Comparing 10K against the other standards before buying.

Details

Fineness416.67 parts per thousand
Gold content41.67% by weight
Hallmark417
Pure gold per tola4.860 g of 11.664 g
Standard inUnited States
PrivacyEverything runs in your browser. Nothing you enter is sent anywhere
The fineness on this page is derived from the karat rather than stored, so it cannot disagree with the arithmetic. The mark is the published external figure.

Where this tool stops

Karat, fineness and percentage are definitional and never change. Everything involving money depends on the rate, the charges and the deduction you enter — none of which are stored on this site, because they move constantly. Hallmarking law and the legal minimum karat differ by country; check your national assay office before relying on a stamp.

Frequently asked questions

What percentage of gold is 10K?
41.67% by weight. That is 10 parts gold in 24, or 416.67 parts per thousand, which is why it carries the 417 mark.
Why is 10K stamped 417?
The mark, 417, sits ABOVE the arithmetic figure of 416.67. This is the only standard mark that does, so an alloy that is exactly 10 karat is not entitled to the stamp and has to be made slightly richer to earn it.
How much pure gold is in a tola of 10K?
4.860 grams, out of 11.6638 grams gross. A tola is 180 troy grains, which is exactly three eighths of a troy ounce.
Where is 10K the standard?
United States. National standards are conventions rather than properties of the metal, which is why a piece bought in one country often does not match one bought in another.
Is karat the same as carat?
No. Karat is this purity ratio out of 24. Carat is a mass unit for gemstones, exactly 0.2 grams. American English often spells both the same way, which is where the confusion comes from.
Is the 10K Gold Purity free?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Can you see what I put into this utility?
No. The 10K Gold Purity runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
What do people use the 10K Gold Purity for most?
The jobs it is built for: reading a 417 hallmark and knowing what it guarantees. Working out the gold content of a 10K piece. Comparing 10K against the other standards before buying. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
When is the 10K Gold Purity not the right tool?
Karat, fineness and percentage are definitional and never change. Everything involving money depends on the rate, the charges and the deduction you enter — none of which are stored on this site, because they move constantly. Hallmarking law and the legal minimum karat differ by country; check your national assay office before relying on a stamp. Knowing where a tool stops being trustworthy matters more than the cases where it works.
Which values should I know?
Fineness is 416.67 parts per thousand. Gold content is 41.67% by weight. Hallmark is 417. These are printed on the page itself, so you do not have to take them on trust.
Can I rely on this for exact work?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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