Check out these markings hope they help
HH
GOLD
Karat - % and European stamps
10 K .416
12 K .500
14 K .585
18 K .750
22 K .917
24 K 100 pure
Karat = gold purity
Carat = 1/5 of a gram in weighing gem stones
GP = gold plated
GF = gold filled
HGE = heavy gold electroplated
14 KP = 14/24 pure (.585)
10 K = usually has cubic zirconia stones
14 K and above = usually has diamonds
Test for gold = clean an area and apply nitric acid. If gold nothing will happen, it will stay clear.
Test for silver = clean an area and apply acid oxidizer. If silver it will turn black.
SILVER STAMPS - common USA ones
silver
sterling silver
sterling
ster
Mexico
.925
Rogers - on silverware, not always but frequently.
Taxco
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Comments on this article:
Platinum markings
Written on 08/15/03 at 08:10:55 CST by AllenMI
Platinum is usually marked by:
Pt (atomic symbol)
PLAT
900 Pt
950 Pt
Iridium Plat
The numerical marking indicates fineness in thousands, i.e., the 900 represents 90% pure. Platinum is often alloyed with Iridium, for hardness.
Platinum is heavier than gold. Platinum also has less conductivity than gold, so it will register lower on a meter than gold does.
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