How To Identify Karat of your Scrap Gold.
Most gold jewelry is hallmarked, hallmarks will help you identify the karat of your scrap gold jewelry.
Most 10K jewelry will be stamped with a 10K hallmark although some may have the numbers 417, most 14K jewelry will be marked 14K or 585, most 18K jewelry will be marked 18K or 750, most 22K jewelry will be marked 22K or 916 and most 24k Gold will be marked 999 or 24K.

1OK Gold Jewelry is sometimes stamped with  a 417 hallmark because the pure gold content in 10k jewelry is 41.7%

14K Gold Jewelry is sometimes stamped with a 585 hallmark because the pure gold content in 14K jewelry is 58.5%

18k Gold Jewelry is sometimes stamped with a 750 hallmark because the pure gold content in 18K jewelry is 75%

22K Gold Jewelry is sometimes stamped with a 916 hallmark because the pure gold content in 22K Jewelry and coins is 91.6%

24K Gold jewelry is sometimes stamped with a 999 or 999.9 hallmark because the pure gold content in 24k jewelry and coins is 99.9%.