Hallmarking also known as assay or standard marking is the official quality control mark that determines the purity of gold and other precious metals.
The stamp or etch 14kt and 14K all mean 14 karat gold; authentic gold jewelry should have a stamp to show the purity of the gold in the piece. PC could either mean Gold Plated on Copper or may be a designation as "Plumb Gold Coinage."
The second mark can also be the maker’s mark or a jeweller’s stamp; sometimes they are letters or initials (like “P C”), and sometimes they are ornate icons (like a heart or a bell, for example).
The Hallmarking Act 1973 stipulates the use of symbols to identify the precious metal, like for 14 carat gold which is marked 585; this millesimal stamp number tells us the precious metal content.
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