GOLD

The gold is the first metal known by people. Despite of being extremely rare metal this is not surprising that the use of exactly this metal and not other less rare metals raised humanity to a new level and opened a new era - the era of metal.

gold coins
gold bullions

The gold is a shiny yellow, ductile and malleable metal. Chemically it is very stable. It doesn't oxidises at air and is moisture resistant. It doesn't react to individual acids but can be solved by nitro-hydrocloric acid – so called aqua regia - or alkaline solutions of cyanide. The gold dissolves in mercury forming amalgam alloys.

Gold is mined from underground ore and consequent heat treatment to clean the impurities. In natural samples there are always other elements such as silver, copper and more. After purifying follows casting bars of different weights, 1 g., 5 g., 10 g., -12000 G., which have minimal residual impurities.

Gold Bars Measurement

The weight of gold bars is measured by grams ot kilo (1000 grams). Another measurement units are ounce (31.10 g), tael (37.32g, 1.2oz) and tola (11.66g or 0.38oz). Tael and tola are used as a measure mostly in Asia.


Here you can find conversion between the different measures.

Gram
1

2

2.5

5

10

20

50

100

250

500

1000

12440

Ounce
0.03

0.06

0.08

0.16

0.32

0.64

1.61

3.22

8.04

16.08

32.15

400

DImmensions (mm)
15 x 8 x 0.4

15 x 9 x 0.6

21 x 13 x 0.6

23 x 14 x 0.7

31 x 18 x 1

39 x 22 x 1.3

45 x 25 x 2.3

55 x 31 x 3

55 x 25 x 10

65 x 32 x14

80 x 40 x 18

200 x 80 x 45

Tola

1

3

5

10

Gram

11.66

34.98

58.3

116.6

Tael

0.5

1

2

5

10

Gram

18.66

37.32

74.64

186.6

373.2

Ounce

0.38

1.14

1.9

3.8

Ounce

0.6

1.2

2.4

69

12

The biggest gold bar in the world is made in Japan in year 2005. It weights 250 kg and is registered in Guiness Books of World Records.

Gold Alloys

Addition of different elements changes the properties of the gold. The most used metals in golden alloys are as follows:

Copper - makes it harder and gives redish colour.

Cadmium – lowers the melting point and gives a greenish tinge.

Nickel – increases the hardness, coloring in pale yellow and is used as component in white gold.

Platinum - increasing plasticity and used in white gold.

Gold alloys are used for making different jewelery. The purity of gold in the jewels is measured by carats. They represent 24 times purity by mass. There are the following gold alloys by carats and additional ingredients:

14K

Yellow gold

Gold – 58%

Silver – 4-28%

Copper – 14-28%


White gold 14Kt A

Gold – 58,3%

Copper – 17%

Zinc – 7,6%


White gold 14Kt B

Gold – 59%

Copper - 25,5%

Nickel – 12,3%

Zinc – 3,2%


white gold ring

18K

Blue gold

Gold - 75%

Iron – 25%


Yellow gold

Gold – 75%

Silver – 10-20%

Copper – 5-15%


Green gold

Gold - 75%

Silver – 11-15%

Cadmium– 12-14%


Red gold

Gold - 75%

Copper – 25%


White gold

Gold – 75%

Silver – 18,5%

Copper – 1%

Zinc – 5,5%

22K

Yellow gold

Gold – 92%

Silver – 4,2%

Copper – 4,2%

White gold-1

Gold - 90%

Palladium – 10%


White gold-2

Gold – 75-85%

Nickel – 8-10%

Zinc – 2-9%

Currently some divide the "white gold" into "noble" and "ignoble". Noble white gold is obtained by adding to pure gold precious metals - platinum, palladium and silver. Complementing the fine gold by ferrous alloys containing nickel, copper and zinc is ignoble white gold. The most prestigious and expensive white gold is an alloy of pure gold and platinum.

black gold ring

One of the latest innovations in the jewellery fashion is the exotic "black gold". There are several ways to get the black gold. The most common of them is oxidation of alloy of gold, cobalt, and chromium at high temperature or the gold is covered with a layer of amorphous carbon. Another very popular method is covering the surface with a layer of black rhodium or ruthenium. This technology makes it possible to achieve an unusual gold jewellery, with exquisite shades of grey or black.

Another way of expressing the purity of gold in the alloys is millesimal fineness:

  • 375 - gold - 38%, included silver, copper and other elements
  • 500 - gold - 50,5%, included silver and copper
  • 585 - gold - up to 59%. includes silver, nickel, copper, zinc and others
  • 750 - gold - up to 75,5%, includes silver, platinum, nickel, copper and others
  • 958 - gold - up to 96,3%, includes silver and copper

Conversion between carats and fineness:

24K = 999

22K = 916

20K = 833

18K = 750

16K = 625

14K = 585

10K = 417

9 K = 375

8 K = 333


Namefully

Gold as Investment

Unlike money gold passed the test of time and keeps its value over the centuries. The most important feature of gold is that it is protected investment against inflation in the long run. It is historical fact that in tough economic periods the precious metals increase their value in times.

If you want to invest in gold you should buy significant quantity at good price.

There are different ways of investment in gold.

You can buy a gold certificate verifying ownership of gold that is stored in some of the largest databases in the world. You scn buy and mutual funds tracking a gold index, gold ETFs (fund type, differing from each other) or straight gold mining company shares.

Another option is the metal itself in the form of gold coins and bullion. The difference between them is minimal - investment gold coins have no numismatic value and the price is determined only by the price of the gold of which they are made.

Investment News

Up to top
› Gold

› Gold