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I am an avid metal detector user and am studying up on some of the industry terminology as I prepare to get some of the items I have found refined. For example, what is meant by “gold filled”, “troy ounce” and “pennyweight.” — Rick in Louisiana, MO

Thank you for you inquiry, following are some of the common terms used in the precious metal refining industry.

Carat – a unit of weight for gems
Karat (K, kt) – is measure of purity for gold
Fineness – the proportion of pure precious metal in an alloy, often expressed in parts per thousand
Fine Weight – the metallic weight of a coin, ingot or bar
Gross Weight – the total weight of an item, including the alloying metal
Gold Standard – a monetary system in which a region’s common medium of exchange are paper notes that are normally freely convertible into pre-set, fixed quantities of gold
Hallmark (plate mark) – an official mark or stamp indicating a standard of purity, used in marking gold and silver articles.
Luster – a substance, as a coating or polish, used to impart sheen or gloss
Ounce – a unit of weight. In the precious metals industry, an ounce means a troy ounce equal to 31.1035 grams
Spread – the difference between the buying price and the selling price of a precious metal
Troy Ounce – a unit of weight equal to 480 grains or 1/12 of a pound
Grain – the smallest unit of weight
Face Value – the nominal dollar amount assigned to a security by the issuer
Retail Value – the sale of goods or articles individually or in small quantities directly to the consumer
Pennyweight (dwt, pwt, PW) – a unit of mass which is the same as 24 grains, 1/240th of a troy pound, 1/20th of a troy ounce, approximately 0.055 ounces or approximately 1.555 grams
Hardness (HV) – sometimes called “scratch resistance,” the Vickers Hardness scale tests hardness of a metal by pushing a pointed object into the surface with a specific load and gauging penetration
Metal – any category of electropositive elements that usually have a shiny surface; typical metals are from salts with non-metals, basic oxides with oxygen and alloys with one another
Salt – crystalline chemical compound formed from the neutralization of an acid by a base containing a metal or group acting like a metal
EPNS – electroplated nickel silver or silver plate
Gold Filled (G.F.) – an item that has a thin outer layer of gold over a base metal. Items must be at least 1/20 gold by weight to be called gold filled
Gold Rolled (R.G.P) – Popular during the 19th century where a very thing sheet of solid gold is laminated to a lesser metal then fused together
Gold Plating – also referred to as electroplate (GEP), is a process where one metal is coated with another metal using electricity
Pinchbeck – gold substitute made with a combination of 9 karat gold, copper and zinc
Vermeil – usually gold plated sterling silver

Are there any precious metal terms we left out that you would like to know?

As one of the largest silver refiners in the U.S., we process thousands of different silver items every year.  One of the most common is silver flatware.  In today’s less formal world, many of you apparently just don’t have a need for that set of sterling you inherited or those silver candlestick holders you got as a wedding gift years ago.  Check out this video where we explain some of the issues related to valuing silver flatware and weighted items.