9k Gold Calculator – 9ct / 375 Melt Value

In the UK, Ireland, and much of Australia, everyday jewellery is often 9 carat (9ct) — not 10K. People still price it like U.S. 10K or shrug it off as “not real gold,” and both mistakes leave money on the counter.

Nine parts in twenty-four is still solid gold under hallmark law. The melt number is just lower per gram than 14ct or 18ct. This calculator locks purity near 37.5% (hallmark 375) so weight and spot match what 9K / 9ct means at the bench.

What 9K / 9ct actually pays for

You're selling the fine gold inside the alloy. Nine parts in twenty-four. Roughly 3.75 g of pure gold in every 10 g of solid 9K.

UK hallmarking uses 375 for 9ct. U.S. shops that mainly see 10K / 417 sometimes under-read a 375 mark if they aren't looking. Bring the stamp language with you.

Solid 9K / 9ct / 375 only. GF, plate, or rolled gold need a different path — not this purity.

Steps before you hit calculate

Read every clasp, shank, and tag for 9K, 9ct, 9 Kt, or 375.
Pull out 10K, 14K / 14ct, 18ct, and filled pieces — one wrong piece skews the bag.
Weigh dry metal. Note stones and steel findings you can't pull.
Match the scale unit: grams, DWT, or troy ounces — don't switch mid-math.
Compare the result to the offer. Cash often sits under full melt after assay.

9K vs 10K (don't mix the stamps)

Mark	Approx. purity	Common market
9K / 9ct / 375	≈ 37.5% (9 ÷ 24)	UK, AU, IE, much of Europe
10K / 417	≈ 41.7% (10 ÷ 24)	United States minimum for “karat gold”

Pricing a 375 piece as 10K invents value that isn't there. Pricing 10K as 9ct leaves cash on the table. Sort first.

For stamp context across karats, keep the gold purity hallmark chart open.

Quick 9K reference

Measure	Figure
Karat	9K / 9ct
Purity	≈ 37.5% (9 ÷ 24)
Common mark	375
Pure gold in 10 g of 9K	≈ 3.75 g
Pure gold in 10 DWT of 9K	≈ 3.75 DWT fine basis

Formula: value ≈ weight × 0.375 × gold price on the same unit basis.

EXAMPLE — 20 g chain at illustrative spot

EXAMPLE spot: $4,000 / troy oz (illustrative only — not a live quote).

Pure gram price ≈ 4000 ÷ 31.1035 ≈ $128.60 / g.

Solid 9K chain, 20 g, stones out:

Fine gold ≈ 20 × 0.375 = 7.5 g
Melt-style ≈ 7.5 × 128.60 ≈ $965.

Run the same weight at 10K purity (0.417) by mistake and you invent roughly 11% more value that isn't in the metal. Lock 9K first.

Sorting tricks that save a ticket

Heavy stone clusters hurt 9K worse than higher karat — less fine gold per gram of scale weight. Pull what you can.

Broken 9ct fragments almost always track scrap. Clean wearable bands sometimes clear a jewellery offer above melt. Don't force one path on both.

If the number surprises you, change one input: purity, weight, or spot. Guessing three things at once just moves the fiction around.

9k gold calculator gold value tips — Visual guide supporting 9k gold calculator — weight, karat, and melt-style estimates.

Related tools and guides

Frequently Asked Questions

How much pure gold is in 9K / 9ct?

About 37.5% of the alloy weight (9 ÷ 24). Ten grams of solid 9K hold roughly 3.75 g of pure gold before stones or hardware.

Is 9ct worth selling as scrap?

Often yes in sizeable lots. Per gram it returns less than 14ct or 18ct. Run the number, then stack offers against that melt-style line.

What does 375 mean on jewellery?

375 marks ≈ 37.5% gold — the UK/AU standard for 9 carat. Confirm the piece is solid, not filled or plated.

Is 9K the same as 10K?

No. 9K is ≈ 37.5%; 10K is ≈ 41.7%. Different purity, different melt. Don't swap them on the ticket.

Why is the cash offer under my estimate?

Testing, refining, and dealer margin pull cash below full melt. Fuzzy stamps widen the gap. Ask which purity they used on the ticket.

Does this work in pennyweight?

Yes. Enter DWT if the tool allows, or convert with 1 DWT ≈ 1.55517 g. Keep purity at 0.375 either way. More unit detail: pennyweight vs grams vs troy ounce.

Disclaimer

Estimates assume solid 9K / 9ct at stated purity. Stamps lie sometimes. Settlement follows assay and buyer terms. Educational use only.