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Gold Facts

Colors of Gold:

Gold is a mixture of gold, silver and copper. Too much silver will provide a greenish tint and too much copper will provide a reddish tint resulting in rose gold.
The addition of Nickel will overpower the yellowish tint of gold, with the result being white gold.

Gold Purity:

The purity of gold can be described by the following three methods:
  • Karat: parts of gold per 24
  • Percent: parts of gold per 100
  • Fineness: parts of gold per 1,000 (European System)

Karat              Percent               Fineness
24K                 100%                 1000
22K                 95.83%                958
18K                 75%                    750
15K                 62.50%                625
14K                 58.33%                583
10K                 41.67%                417
9K                   37.50%                375

Rolled Gold Plate (RGP):
Jewelry that has a 14K R.G.P. mark is not a 14 karat gold piece of jewelry. The R.G.P. stands for rolled gold plate (RGP). RGP is the applying a layer of gold alloy to a layer of base metal with the gold alloy having some Karat rating such as: 14K. Rolled gold plating were popular in the 1800s and 1900s.


This is gold plating of some type over sterling silver.

Gold Leaf:

24K gold that is formed into sheets that is then applied over a surface by hand.

The letter "P":
may be found following the karat designation on a jewelry item, i.e.:14KP. The letter "P" represents the word plumb, plumb indicates that the gold content is not less than 14 Karat.

HGE is Heavy Gold Electroplate - not solid gold.

Gold Filled is marked to show, a gold layer on the outside of a base metal. For example, the mark 1/12 14kGF. This means the gold layer is 14k and the gold is 1/20 the weight of the total metal in the item.

Silver Facts:

Sterling Silver jewelry is often marked 925 or .925 (92.5% fine silver)
Other silver jewelry hallmarks include .800, .813, .875, .935, .980 or other number variations that depend upon the represent the silver content
European countries also use a variety of other symbols to mark silver jewelry and non-jewelry items.

These marks can be used in conjunction with purity or other designations.
England: the walking lion
Scotland: the thistle, before 1975
Russia: hammer and sickle in star mark
Sweden: "S" (in hexagon indicating 830 silver or higher)
France: a boar’s head (from 1838 to 1961) and outside of Paris, the crab mark

Platinum Facts

Platinum or PLAT if the jewelry is .950 or 95% or more platinum.
Other marks are Pt1000, 1000Pt or 1000Plat for pure platinum; or Pt950, 950Pt.

If less than 95%, the mix is shown such as 10% IRID PLAT, meaning the item is 90% platinum and 10% iridium (Iridium is actually more expensive than platinum). Also you will sometimes see imported items with 800 PLAT, 80% platinum popular in a few foreign countries.

Gold Purity Calculation

    Karat Rating   Percent        Formula
  • 24K..100%.....24/24= 1   x 100=100%
  • 22K..91.7%....24/22=.917x 100=91.7%
  • 18K..75.0%....24/18=.75  x 100=75%
  • 16K..66.67%..24/16=.667 x 100=66.67%
  • 14K..58.33%..24/14=.583 x 100=58.33%
  • 12K..50.0%....24/12=.50  x 100=50%
  • 10K..41.67%...24/10=.417x 100=41.67%
  •   9K..37.5%....24/09=.375x 100=37.5%
Calculation Steps One to Three to Find Gold's Market Value:

1st) 31.1034 grams or ONE ounce of 14K gold
2nd) 31.1034 times 58.33% (14K) equals 18.1426 grams of gold
3rd) Suggested Gold Market value of $800 divided by 31.1034 grams equals $25.72 per gram.

Calculated Step Four to Find Value of 14K:

4th) 18.1426 grams times $25.72 equals $466.63 of Gold value.

Step 5: Your Return on 14K Gold Sold to Refiner:

5th) $466.67 times refiner percentage to you 94% equals return to you $438.67.

Or Use This Precious Metal Calculator from Dendritics

Updated: November 05, 2019