Read the stamp
What does 18KP mean on jewelry
For an 18KP stamp, 18K GF, 18K RGP and 18K HGE describe the gold layer over another metal. 750 is the corresponding common fineness stamp.
18K and 750
The karat figure counts gold parts out of 24. 750 is the corresponding common fineness stamp. KP is read together; P does not stand for plated here. Rings often carry the stamp inside the band; chains may carry it on an end tab or clasp.
What to check next
18K GF, 18K RGP and 18K HGE describe the gold layer over another metal. Retain the suffix when reading a small stamp. Compare a worn K with the letters in any maker signature beside it; the maker initials and the purity mark answer separate questions.
Related marks
183 marks
Undated
Charles Loloma
Eleven-stroke-style angular name cut into metal; 18K is a separate fineness inscription, not a second maker mark.
Undated
Van Cleef & Arpels
Widely spaced initials and separate diagonally placed metal-standard numerals on an openwork clasp.
Undated
Ciner Mfg. Co. Inc.
New York NY, United States
The source lists C M C, Ciner, CMC and Mayfair variants with separate circa dates that are not assigned to this image.
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