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24K Gold Purity

What 24K gold means: 100.00% gold, stamped 999, with the pure gold weight per tola and per troy ounce.

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In short 24K gold is 24 parts gold in 24, which works out to 1,000.00 parts per thousand and 100.00% gold by weight; the remaining 0.00% is alloy, usually copper, silver, zinc or nickel, and it is what sets the colour and the hardness. It is stamped 999. The mark rounds DOWN from 1,000.00 to 999, because a hallmark is a guaranteed minimum and may never claim more gold than the metal holds. In practical weights, one tola of 24K — 11.6638 grams gross — contains 11.664 grams of pure gold, and one troy ounce of it contains 31.103 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 Bullion worldwide, where it is used for bars, coins and investment gold. 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 24 karat piece can weigh anything at all.

How to use the 24K Gold Purity

  1. Read the fineness and percentage for 24K.
  2. Check the pure gold weight per tola and per troy ounce.
  3. Switch the selector to compare with another karat.

About the 24K Gold Purity

What 24K gold means in fineness, percentage and pure gold weight, and where it is the standard.

What people use it for

  • Reading a 999 hallmark and knowing what it guarantees.
  • Working out the gold content of a 24K piece.
  • Comparing 24K against the other standards before buying.

Details

Fineness1,000.00 parts per thousand
Gold content100.00% by weight
Hallmark999
Pure gold per tola11.664 g of 11.664 g
Standard inBullion worldwide
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.

Explained in our guides

All guides

Frequently asked questions

What percentage of gold is 24K?
100.00% by weight. That is 24 parts gold in 24, or 1,000.00 parts per thousand, which is why it carries the 999 mark.
Why is 24K stamped 999?
The mark rounds DOWN from 1,000.00 to 999, because a hallmark is a guaranteed minimum and may never claim more gold than the metal holds.
How much pure gold is in a tola of 24K?
11.664 grams, out of 11.6638 grams gross. A tola is 180 troy grains, which is exactly three eighths of a troy ounce.
Where is 24K the standard?
Bullion worldwide. 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.
Does the 24K Gold Purity cost anything?
No charge and no sign-up. There is no free tier to run out of because there is no paid tier — inputtesthub.com is funded by advertising rather than by metering the page.
Does anything I enter leave my computer?
No. The 24K Gold Purity runs entirely in your browser using JavaScript. Because the work happens locally, the page also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
What problem does the 24K Gold Purity solve?
In practice it gets used for three things: reading a 999 hallmark and knowing what it guarantees. Working out the gold content of a 24K piece. Comparing 24K against the other standards before buying. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
What are the limits of the 24K Gold Purity?
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.
What are the reference figures here?
Fineness is 1,000.00 parts per thousand. Gold content is 100.00% by weight. Hallmark is 999. These are printed on the page itself, so you do not have to take them on trust.
How precise is the result?
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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