How To Test gold Jewelry at home


A forgery of a gold sovereign fact lead to the same thickness and diameter as the true would be 35% lighter than the real thing. If I had the same weight and diameter as the true would be a 54% thicker than the real thing.

The difficulty lies in finding a more dense metal than gold. Almost all metals are less dense than gold and metals that are heavier are more expensive than gold. 100 years ago platinum was cheaper than gold and used to counterfeit gold coins, but in recent years has become more expensive than gold and is no longer an option. Some analysts say that modern counterfeiters use tungsten. A tungsten core covered with a thin gold layer. Tungsten has a density of 19.25 gm/cm3 and gold of 19.3 gm/cm3.

Tungsten is cheaper than gold, but not used in the past because its melting point is above 1000 degrees and there are few facilities where we can reach this temperature. To overcome this obstacle, the tungsten powder is ground and mixed with other metals in a mass of correct size and format with a proportion of metals that are more or less similar to the density of gold.

Professionals often recognize gold gold just for the experience of working with him, only to see it and touch it, but have the following tools if in doubt:

Acids to test1. Gold acid test
The acid test is used by jewelers and professional buyers. A professional jeweler or buyer often recognizes the quality of a piece by touch, weight and quality of the object to check, but if you can test with acids to determine the purity of gold in case of doubt. This test is gently rubbed some of the gold against Arkansas stone (in English: Arkansas stone test), leaving a trail of gold above the stone. There are different quilatajes acids, but the main ones to check 10, 14, 18, 20 and 22 carats.

When applying a drop of the acid and no reaction with the trace of the metal above the stone or metal disappears, it is gold and have a minimum karat quality corresponding to the acid was used. Repeat the test until the gold react with acid and change color or disappear. If the acid slowly dissolves gold is possible that the karat is only slightly less than the level of the acid used.

Acid only checks the gold sample is analyzed and is a factor that professionals use, apart from experience, to check the quality of gold.

2. X-ray test-Ray to measure the density of gold
X-rays are emitted through a coin or bullion and see how many pass through the object and in no time you know, in percentage, the content of gold, silver, copper or other metals of the area being analyzed. This method is less interesting to see coins or ingots of up to 200 to 250 grams, but very useful for checking jewelery or large ingots possible to analyze different points of the piece without damaging it. This method does not damage the part and has a very high level of assurance.

3. Cupellation of gold (in English: Fire test)

The safest test is the cupellation in which the piece is melted in a furnace. Although this is not practical for most cases, because it has to destroy the part. Refiners and assayers have adequate facilities for this type of test. This test can check up to .999 purity.