Friday , 17 November 2017


What Do Gold Measurements "Troy" Ounce and "Karat" Really Mean?

You have no doubt read countless articles on the price of gold costing x dollars per “troy ounce” or perhaps just x dollars per “ounce” but the difference between the two measurements is significant. For that matter, what’s the difference between a 24 karat gold ring and an 18 karat gold ring?  Let me explain. Words: 863

Lorimer Wilson with Gold Bar
munKNEE.com Editor-in-Chief Lorimer Wilson Holding a Gold Bar
 

So says Lorimer Wilson, editor of both www.FinancialArticleSummariesToday.com (A site for sore eyes and inquisitive minds) and www.munKNEE.com (Your Key to Making Money!). Please note that this paragraph must be included in any article reposting with a link* to the article source to avoid copyright infringement.

Wilson goes on to say:

Definition of a ”Troy” Ounce

A “troy” ounce (ozt) is a unit of imperial measure for weight that dates back to the Middle Ages. Originally used in Troyes, France, it is most commonly used to gauge the weight and therefore the price of precious metals. One troy ounce is equivalent to 1.09714 avoirdupois (our conventional every day measurement) ounces – i.e. 9.714% greater in weight – and 31.1034768 grams. 1 kg. consists of 32.1507466 troy oz. Please keep the distinction between ounces and troy ounces in mind when buying small quantities of gold and/or silver.

Definition of “Karat”

The term “karat” is used to describe the unit of measurement for the proportion of gold (i.e. % purity of the gold content) in a piece of jewellery, coin, ingot or bar as per the above table.

Gold will often be mixed with “filler metals” such as silver, palladium, platinum, nickel and even copper to combat the softness of pure 24 karat.

  • Gold which contains a degree of silver, platinum or palladium is referred to as ”white gold” and will classify with a higher amount of karats while the presence of nickel leads to a slightly lower designation of karats.
  • Copper is used to give gold durability and give it a golden rosy tone.

Below is a table outlining the karat designations at various gold purity levels plus the extent of ”fineness” as is used in some countries such as Italy.

Karat/Fineness Gold Content [Purity]
24 karat 99+%
22 karat/917 91.6%
21 karat 87.5%
20 karat 83.3%
18 karat/750 75.0%
15 karat 62.5%
14 karat/583 58.5%
10 karat/417 41.7%
9 karat 37.5%
8 karat 33.3%
1 karat 4.2%

 

(In some countries “karat” and “carat” are used almost interchangeably although, strictly speaking, the words’ correct meanings are as defined in this article where “carat” refers to the weight of a gemstone (see below). The correct word to use when referring to the weight of an object of gold, silver or other precious metals is to speak in terms of troy ounces as below, kilos or metric tonnes.)

100% pure gold is defined as having a purity of 24 karats so if something is 24 karat gold then it’s made of gold and nothing else – regardless of size… Gold is a relatively soft metal and high-karat gold tends to be easily damaged and, as such, a 24 karat item is usually reserved for display or ceremonial use as the picture of me with “my” 100kg. Canadian Maple Leaf 99.99999% pure gold coin which is now worth in excess of $5,465,626.92 USD! (100kg. x 32.1507466 troy oz. x $1,700/ozt. USD)

World's First 100-kg, .99999% Pure Gold Bullion Coin
munKNEE.com Editor-in-Chief Lorimer Wilson with the world’s first 100-kg, .99999 pure gold bullion coin with a $1 million face value (and current value of approx. $5,500,000!). It was produced by The Royal Canadian Mint

 

All jewellery is required by law to be stamped so consumers will know the quality of gold used. Jewellery made in North America is typically marked with the karat grade (10K, 14K, etc.), and jewelry made in Italy is typically marked with the “fineness” such as (417, 583, etc.). Most retail gold items have a karat rating in the range 9 to 18. In the U.S. the minumum karat value for an item to be sold as gold jewelry is 10. In the UK 9 karat is more common.

The number 24 may have originally been chosen to represent pure gold because it divides evenly by 2,3,4,6 8 and 12. Thus it’s easy to talk about a gold item being half pure (12 kt), two thirds pure (16kt) etc. Nine karat would thus be three eighths gold, 18 karat would be six eighths (three quarters).

Conclusion

Never again will you be misled when reading about or considering the purchase of any item in which such terms are (often loosely) used.

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