Is 585 the same as 14K in the calculator?

Yes—both mean the same gold fraction. Choose 14K (or the equivalent purity) when the stamp is 585.

What about 375 vs 417?

375 is often 9K; 417 is 10K in millesimal fineness. Match the stamp to the karat tier your tool uses.

Blog·Hallmarks

Gold Hallmarks 585, 750 & 417: How to Use Them in a Calculator

This article is a fast workflow companion to our deep dive gold karat stamps & hallmarks guide. If you already see a three-digit stamp, here is how to turn it into the right dropdown on a calculator—and which programmatic pages to open for cross-checks.

585 → 14K

585 means 58.5% gold—definitionally 14 karat. In any MyGoldCalc tool, pick 14K. For a dedicated stamp page with melt context, see 585 hallmark.

750 → 18K

750 is 75.0% gold = 18K. Use 750 hallmark for a quick reference, then 18K melt hub for gram and jewelry pages.

417 → 10K

417 fineness matches 10K (41.7% gold). See 417 hallmark and the 10K gold value index for weights and types.

375 (often 9K)

375 is 37.5% gold—commonly 9K in markets that use it. Use 375 if your calculator supports 9K; otherwise align with your tool's closest tier and treat the result as approximate until purity is verified.

FAQ

Disclaimer: Stamps can be wrong or counterfeit; professional testing may be required.