Understanding Markings on Jewelry

Published by Jason Sessler on 28th Jan 2021

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

9K9 Karat Gold
10K10 Karat Gold
12 Karat Gold
14K14 Karat Gold
18K18 Karat Gold
20K20 Karat Gold
22K22 Karat Gold
24K24 Karat Gold
.41710 Karat Gold
.58514 Karat Gold
.75018 Karat Gold
.83320 Karat Gold
.99924 Karat Pure Gold (Yellow Gold)
PPlumb Gold (must be the karat weight stamped or higher)
PT Platinum
900 or 950Platinum (90% or 95% pure platinum mixed with alloy)
10%irid-platinumPlatinum alloyed with 10% iridium
S.S.Stainless Steel
SteelStainless Steel
St. SteelStainless Steel
SilverSterling Silver
S. Silver Sterling Silver
Sterling SilverSterling Silver
925Sterling Silver
.950Sterling Silver
KPKarat Plumb
CZThere is a cubic zirconia in the ring (not a diamond)
G.F. or G.P.Gold Filled or Gold Plated
SOLSolitaire Diamond (usually followed by some carat weight)
ctCarat (referring to stone weight)
cwCarat weight of stones
6,7,8,9,10Could refer to ring size
G.E.Gold Electroplated
H.G.E.Heavy Gold Electroplated
WGDWeight 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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