9K Gold Calculator
Price 9K gold, the purity Britain marks as 9ct. It is 37.5% gold, stamped 375, and it is mostly alloy on purpose.
9K gold value
1 troy oz = 31.1 g · 1 oz = 28.35 g · 1 dwt = 1.555 g
9K · 37.5%
Priced as 9 ÷ 24. The usual stamp is 375.
Common 9K weights
| Weight | Pure gold | Melt value |
|---|---|---|
| 1 g | 0.375 g | — |
| 5 g | 1.875 g | — |
| 10 g | 3.750 g | — |
| 20 g | 7.500 g | — |
| 50 g | 18.750 g | — |
| 1 oz | 10.631 g | — |
One piece at 9K, using the price above. 1 oz is the regular ounce (28.35 g), not a troy ounce (31.103 g).
Selling? See what buyers may pay for scrap gold.
Related karats
On this page
9K and 9ct are the same purity: 9 ÷ 24, which is 37.5% gold. The hallmark fineness is 375. This page prices that fraction, not a higher karat someone guessed from the color.
9ct is the British way of writing 9K
The United States says karat and writes K. Britain says carat and writes ct when the subject is gold purity. 9ct is not a gemstone weight. A 9 carat diamond would be an enormous stone of 1.8 grams. A 9ct ring is a gold alloy, nine parts gold in twenty-four, which is 37.5%. The number on the metal is usually 375, the fineness required under the UK hallmarking system. 375 parts per thousand is exactly 37.5%, so the stamp and the formula agree. That is cleaner than the 14K and 585 pair.
You meet 9ct on British and Irish jewelry, and on older pieces from Australia and New Zealand, where British hallmarking habits traveled. Signet rings, curb chains, lockets, cufflinks and a great deal of mid-century high-street gold are 9ct. New jewelry made for the American market is almost never 9ct, because US rules do not let a seller call anything under 10K “karat gold”. The metal can still cross the Atlantic in a jewelry box. When it does, an American buyer may shrug and say “low karat”. The right description is 9ct, and the right purity is 37.5%.
A full UK hallmark is more than the fineness. It carries a sponsor’s mark and an assay office mark. London, Birmingham, Sheffield and Edinburgh have been the offices people look for. The office tells you the piece was assayed. The 375 tells you the gold fraction. For melt value you only need the fraction and the weight. The office mark is a reason to trust the fraction, not a separate premium this calculator can price.
Pale, hard, and still gold
At 37.5% gold, the alloy is the majority. Copper, silver and zinc decide the color and the stiffness. Yellow 9ct can look brassy beside an 18K chain. It can also look pleasantly light, which is why so many everyday British rings were made in it. The hardness is the practical gift. A 9ct signet with a crest on the face takes daily knocks better than a 22K ring would. The crest is still only 37.5% gold, so a buyer who melts it is buying that fraction.
People argue about whether 9ct “counts”. It counts as gold content. It does not count as high-karat gold, and it should not be sold with an 18K story. The honest description is the one the hallmark already gives: 375, a bit over a third gold. Scrap buyers who understand British jewelry will test it and bid on that third. Buyers who only know 10K, 14K and 18K sometimes undervalue it because the stamp looks unfamiliar, or overvalue a plated piece because someone said “English gold”. The stamp is the defense against both.
Stones, enamel and steel springs are not part of the 37.5%. A locket with a photo and a glass front should be weighed as metal, or the buyer will do that for you and the weight will drop. Hollow 9ct chains exist, especially lighter curb and trace patterns. The link can look substantial and weigh very little. Trust the scale.
How to recognise a 9ct piece
Look for “9ct”, “9c”, “9K”, or “375”. On a ring the mark is inside the shank. On a chain it is on the clasp or on a small plate near the clasp. A full hallmark clusters several tiny punches. One of them is the fineness. If you can only read one symbol and it is 375, that is enough to use this page. If the only mark is a maker’s name, you do not yet know the karat.
Do not confuse 9ct with 9 carat gemstones, and do not confuse it with 19K or 10K because the digits are neighbours. 10K is 41.7% and is stamped 417. It is close, and it is not the same. A piece brought from Britain with a clear 9ct mark should stay on this calculator even if the person buying it would rather think in 10K.
Plated items stamped “9ct” without a fineness are a known problem in unmarked costume jewelry, but a proper 375 punch is a strong sign of solid 9ct. Rolled gold and gold-filled pieces are marked in other words, often with a fraction. If the mark says rolled gold, gold front, or GF, this solid-gold result does not apply. The gold karat calculator is for converting a number you can read. It is not a way to invent a karat for a piece with no mark.
An 8 gram 9ct signet at the live price
A man’s 9ct signet, the kind with a plain face or a lightly engraved crest, often weighs somewhere around 6 to 10 grams. Eight grams is a fair middle for a ring that has been worn, not a large ceremonial ring and not a woman’s thin band. The example prices those 8 grams, then shows what the same weight would be in 10K and in 14K at the same quote.
The worked example uses 8 gram 9ct signet ring and fills in from the price in the calculator.
Take that melt value to a buyer as a ceiling, not as a demand. UK high-street buyers and US pawn shops both pay under melt. The scrap gold calculator shows the kind of ranges those offers usually fall in. A 9ct piece does not get a worse percentage because it is 9ct. It gets a lower melt, because only 37.5% of the grams are gold, and then a buyer’s ordinary discount.
If your scale speaks pennyweights, switch the unit before you type. One pennyweight is 1.55517384 g. One troy ounce is 31.1034768 g. One regular ounce is 28.349523125 g. Eight grams is about 5.1 pennyweight. Typing 8 into a pennyweight field would describe a much heavier ring. The hint under the unit switch is there so the three gold units stay distinct from the kitchen-scale ounce.
9ct next to 10K and 14K
10K is the nearest American karat, at 41.7% gold. 14K is the everyday American karat, at 58.3%. Same weight, 9ct holds 9/10 of the pure gold in 10K and 9/14 of the pure gold in 14K. The second of those is the comparison that surprises people who grew up on 14K: a 9ct chain is not “half of 14K”. It is a bit under two thirds, per gram. A heavy British curb can still beat a fine 14K trace chain on pure gold, because the curb has more grams.
| Mark | Percent | Stamp | Pure gold in 10 g |
|---|---|---|---|
| 9ct / 9K | 37.5% | 375 | 3.75 g |
| 10K | 41.7% | 417 | 4.17 g |
| 14K | 58.3% | 585 | 5.83 g |
Ten grams of 9ct contains exactly 3.75 grams of pure gold, because 9 ÷ 24 is exactly 0.375. That row will not go out of date. The money it is worth will. Use the calculator above for the money, at whatever quote is on the screen, and keep this table as the purity check.
Higher karats are a different tradition. 18K and 22K are what you see on continental fine jewelry and on South Asian wedding gold. Pricing a 9ct signet on those pages would invent gold that is not in the ring. If the hallmark is worn smooth and you only have a guess, say so, and have it tested. The gold calculator can price a custom percent after a test. This page is for the pieces that really are 9ct.
9K Gold Calculator questions
Is 9ct the same as 9K?
Yes. Britain writes carat, abbreviated ct, for gold purity. The United States writes karat, abbreviated K. 9ct and 9K are both 9 parts gold out of 24, which is 37.5%. The stamp is 375. A British hallmark will say 375, often with the assay office mark, rather than “9K”.
Is 9ct real gold?
Yes, and it is mostly other metals. Only 37.5% of the weight is gold. The alloy makes it harder and paler than 14K or 18K. Under the UK Hallmarking Act, 375 is a standard fineness, and it is the lowest one in ordinary use. It is gold. It is not high-karat gold, and it should not be priced as if it were 18K.
Where will I see 9ct jewelry?
The United Kingdom, Ireland, and older jewelry from Australia and New Zealand. A full UK hallmark includes the sponsor’s mark, the fineness (375) and the assay office. You will find 9ct on signet rings, chains, lockets and a lot of mid-century high-street jewelry. You will rarely find it on new jewelry made for the US market, where 10K is the legal floor for the word “gold”.
Why does 9ct feel harder than yellow gold I have seen?
Because the majority of the weight is copper, silver, zinc or a similar alloy. Those metals are what you feel when the piece is stiff, pale or slightly brassy. The gold is still in there at 37.5%. Hardness is useful for a ring that is worn daily. It is not extra value. Buyers pay for the gold fraction.
Is a 9ct chain worth less than a 14K chain?
Per gram, 9ct holds 9/14 of the pure gold in 14K, about 64% as much. A heavy 9ct curb chain can still beat a thin 14K trace chain, because pure-gold weight is what matters. Weigh both. Then use this page for the 9ct piece and the 14K page for the other. Do not convert 9ct to 14K by guessing.
Can I sell 9ct gold in the United States?
Refiners and jewelers buy it if a test confirms the gold. They may not call it karat gold, because US rules draw the naming line at 10K. The metal does not stop being 37.5% gold at the border. An honest buyer will weigh it, test it, and bid a percentage of the 9ct melt value. The scrap gold calculator is where that payout range is estimated.