Metal detecting tips

JEWELRY MARKINGS INSIDE RINGS

GOLD
K = KARAT
KP = KARAT PLUMB (EXACT AMOUNT OF GOLD)
K.P. = KARAT PLATE
GF = GOLD FILLED (USUALLY HAS A FRACTION, ie., 1/20 10K GF)
GS = GOLD SHELL
GHE = HEAVY GOLD ELECTROPLATE

DECIMAL EQUIVALENTS OF KARAT RATINGS (PERCENT OF GOLD)::
.375 = 9K (ENGLAND AND CANADA)
.417 = 10K
.500 = 12K
.583 = 14K
.667 = 16K
.750 = 18K
.833 = 20K (ASIA)
.917 = 22K (ASIA)
.999/ 1000 = 24K PURE GOLD

SILVER
925 (.925) = STERLING
835 (.835) A LOWER QUALITY OF BRITISH STERLING SILVER
STERLING
TAXCO
MEXICO
.999 FINE = PURE SILVER
STER

PLATINUM
PT (ATOMIC SYMBOL))
IRID. PLAT..
PT 900