Reading Gold Hallmarks: Karat, Purity, and What Those Stamps Mean
Common stamps
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Karat: 24K, 22K, 21K, 18K.
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Fineness: 999, 916, 875, 750 (parts per thousand).
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Assay/maker’s mark: Identifies the testing authority and manufacturer.
Why it matters
Hallmarks protect buyers: they indicate purity and traceability. A 22K stamp (or 916) should test close to 91.6% gold.
Testing methods
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Electronic testers give quick estimates.
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XRF analysis is precise but costlier.
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Acid tests are inexpensive but require skill.
Red flags
Missing or inconsistent stamps, unusual coloring, or prices far below market can signal problems. When in doubt, test.
Tip
Photograph hallmarks on purchase and keep certificates—this speeds resale and insurance claims.
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