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Silver Information | Gold Information | אבני חן | פנינים

Gold Types and Quality Levels

 

Gold Jewels

Gold Jewels: rings, bracelets, pendants, earrings and other jewels. These are made of gold mixed with other metals. Strength and color can be altered by changing the composition of other metals. Metals often added to gold are silver, copper, nickel, palladium and sometimes aluminum, iron, zing, and manganese. Popular colors are shades of yellow, white and red.

 

Karat

Measuring unit describing the percent of pure gold in a gold alloy, whereas 24 karat represents pure gold. Thus 14 karat gold has 14 out of 24 pure gold, which is 58.3% gold, and the rest is added metal, which causes the change of color/shade, strength and elasticity of the gold used in jewellery manufacturing.

 

Types – Gold Concentration in Jewels

Pure gold, 24 karat, is not conventionally used for jewellery manufacturing due to the softness of the metal. Jewellery manufacturing conventionally uses gold paired with other metals. In Israel, the least concentrated gold that is sold as gold is 9 karat, which is 37.5%. In US the lowest concentration sold is 10 karat, which is 41.7%. Conventional gold concentrations throughout the world are: 14 karat, which is 53.7%, 18 karat, which is 75%, 22 karat, which is 91.7% and 24 karat – pure gold, which is 99.9%. The purer the gold, the more glowing and yellow its color is. K14 and K18 are the most useful and conventional gold types in jewellery manufacturing.

 

Yellow Gold and its Shades

Yellow is the natural color of gold. The conventional way to create gold less pure than 24 karat is to add copper and silver. The ratio between silver and copper is globally acknowledged. This ratio determines the gold’s shade. In Europe, 12.5% silver and 12.5% copper are conventionally added in K18 gold, which is 75% pure gold.

 

White Gold

For white gold, white glow metals are added to the yellow gold. The basic metals used for creating white gold are gold, silver, palladium; or gold, copper, zing, nickel.

 

Gold of Red/Reddish Shade

For gold of red/reddish shade, a higher percentage of copper is added. Copper gives the gold its red shade, and the more copper added, the stronger the red shade grows.

 

Gold Jewellery Stamping

By law, jewelry items have to be marked with a metal purity hallmark and a trademark of the manufacturer. Usually, the hallmark is found on the back side of the jewelry or near the clasps. Often, the mark is very small and requires the use of a magnifying glass in order to see it.

 

Standard Metal Purity Hallmarks (Gold)

24 Karat Gold - 24K or 999
22 Karat Gold - 22K or 917
21 Karat Gold - 21K or 875
18 Karat Gold - 18K or 750
14 Karat Gold - 14K or 585
9 Karat Gold - 9K or 375

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