What 12K gold is worth and how dealers price it
12K is exactly half gold. It is rare as solid jewellery today, but the figure 12K often appears on gold-filled items (for example '1/20 12K GF'), which contain only a thin gold layer.
Look for the hallmark 500 or 12K. 12K is typical of antique pieces and some gold-filled items. A '12K GF' or '12K RGP' mark means the item is not solid gold; its scrap value is a small fraction of solid 12K, often close to zero at retail buyers.
Dealers weigh the piece, deduct stones and non-gold parts, and multiply the net weight by 0.5 to get the fine gold content. They then multiply by the CZK spot price per gram and apply their payout percentage — usually 60–75% of melt at shops and pawnbrokers, 80–90% at specialist buyers.
Worked example: a 5 g solid 12K antique ring holds 2.50 g of fine gold. Enter 5 g and 12K in the calculator above to see its live melt value in CZK. Check for GF, RGP or 'rolled gold' next to the 12K stamp before calculating — the calculator assumes solid gold.
Czech jewellery is hallmarked by the state Assay Office (Puncovní úřad). Buyers commonly quote per gram of 585 gold, so convert your karat using the calculator before comparing.