Understanding Markings on Jewelry

At Bishops Jewelry, we evaluate jewelry on a daily basis. For instance, one of the first things we look for when inspecting an article of jewelry are the stamp marks. These stamp marks can tell us a lot of information about the jewelry and help us identify things like: metals, carat weight, manufacturer, trademarks, jeweler, or designer. In this article, we will discuss what these stamp markings mean so you can identify these similar markings on your jewelry.


Stamp Key

9K 9 Karat Gold
10K 10 Karat Gold
12 Karat Gold
14K 14 Karat Gold
18K 18 Karat Gold
20K 20 Karat Gold
22K 22 Karat Gold
24K 24 Karat Gold
.417 10 Karat Gold
.585 14 Karat Gold
.750 18 Karat Gold
.833 20 Karat Gold
.999 24 Karat Pure Gold (Yellow Gold)
P Plumb Gold (must be the karat weight stamped or higher)
PLAT Platinum
PT Platinum
900 or 950 Platinum (90% or 95% pure platinum mixed with alloy)
10%irid-platinum Platinum alloyed with 10% iridium
S.S. Stainless Steel
Steel Stainless Steel
St. Steel Stainless Steel
Silver Sterling Silver
S. Silver Sterling Silver
Sterling Silver Sterling Silver
925 Sterling Silver
.950 Sterling Silver
Titanium Titanium
Tungsten Tungsten
Pd Palladium
KP Karat Plumb
CZ There is a cubic zirconia in the ring (not a diamond)
G.F. or G.P. Gold Filled or Gold Plated
SOL Solitaire Diamond (usually followed by some carat weight)
D Diamond
ct Carat (referring to stone weight)
cw Carat weight of stones
6,7,8,9,10 Could refer to ring size
G.E. Gold Electroplated
H.G.E. Heavy Gold Electroplated
WGD Weight gold

You may see other stamps in your jewelry that are not covered here, especially letters in the stamp that indicate the name of the designer or manufacturing company. These are called “Hallmarks” and there are many books and references on their individual meanings.

One thing you will most likely have difficulty with is reading or finding the stamp in your item of jewelry. This is where a loupe, or magnifying glass, will come in handy. Be sure to examine the entire jewelry item thoroughly, there are many places a stamp can be hiding and I have personally been fooled many times.

At Bishops Jewelry, we feel it is very important for our customers to be educated and to know what quality of jewelry they possess. We would like you to welcome you to bring your jewelry in anytime. Whether for cleaning, inspection, looking to sell, or just have some questions, we are more than happy to help.

Bishops Jewelry

1440 University Ave S,

Fairbanks, AK 99709


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