Jewelry Markings

This is a list of markings found on gold jewelry, silver jewelry, and platinum jewelry. There may be more jewelry markings but this is all I have found so far.
GOLD
K=KARAT
KP= KARAT PLUMB (HIGH QUALITY,PURITY)
K.P.= KARAT PLATE
GF=GOLD FILLED (HEAVY PLATING) USUALLY A FRACTION 1/20
HGE= HEAVY GOLD ELECTROPLATE
10K=41.7%PURE
12K=50%PURE
14K=58.3%PURE
18K=75%PURE
22K=91.2%PURE
24K=99.9%PURE
DECIMAL KARAT RATINGS FOR GOLD
.375=9K
.417=10K
.500=12K
.583 AND .585=14K
.625=15K
.667=16K
.750=18K
.833=20K(ASIA)
.917=22K(ASIA)
.999=24K PURE

SILVER
STERLING IS 92.5% SILVER 7.5% COPPER
STERLING MARKS:
.925
.835= BRITISH
STERLING
TAXCO
MEXICO
STER
.999 FINE+PURE SILVER
LION HALMARK = ENGLAND

PLATINUM
PLAT
PT {ATOMIC SYMBOL)
IRID. PLAT.
.900
.950