How to distinguish the purity of gold

The Chinese have had a “gold complex” since ancient times, buying up roughly 40% of the world’s gold production each year. The company’s main goal is to provide a comprehensive range of products and services to the public. How can we tell the purity of gold? Here’s how to identify the purity of gold.

Method 1: Look at the color

The higher the purity of gold after smelting, the brighter and darker the color will be.

Generally at gold content higher than 95% to reflect the rich golden color of gold, rich and bright;

At 90%-95% purity, the gold will be a bit ruddy and light yellow in color and less bright;

80%-85% pure gold will have a greenish-yellow tinge to the light yellow;

65%-70% purity gold will also have a distinct white light in the greenish yellow;

50%-60% pure gold, only a light yellow;

If it is not even 50% pure, the overall whiteness appears white.

Method 2: The tooth bite method

Tooth biting gold is actually testing the hardness of gold. This method can filter some gold that is not of high purity. Pure gold has low hardness and will leave teeth marks if you bite it with your teeth. So, when identifying pure gold, you can try its hardness, it is unlikely to be pure gold if the hardness is too high. (Except for 3D hard gold) This simple and effective method is not generally recommended because it may cause damage to the teeth. Also, because lead is softer than gold, gold-plated lead can leave bite marks on it, causing identification errors.

1. First, bite down on the gold object with appropriate force.

2. See if there are bite marks on the gold piece.
Method 3: Listen to the sound rhythm

Full gold, pure gold jewelry is very high purity, really calm, jewelry will fall to the ground or collide with each other sound will be low muffled and calm, is the “bar” sound, and landed on the ground that does not move; and poor color, low purity or even fake gold to the ground or knock each other, will be issued “when when “The metal sound, sometimes also jumping sound, will also jump after landing. But don’t knock hard, be careful of deformation.
Method 4: Fire method

Pure gold is refined at extremely high temperatures and cooled to form. Gold will not change color when exposed to fire, but generally iron ore will turn black when exposed to fire. If the fire has been burned, the gold mixed with more other impurities will be burned black, while the high purity gold will not change color still shining gold. The actual fact is that you can find a lot of people who have been in the business for a long time.

Method 5: Density test method

1. Weigh it. If you don’t have a balance yourself, you can ask the jewelry to weigh it for you, usually for free. The weight should be accurate to the gram.

2. Fill a vial with water. It is best if there is a millimeter scale on the wall of the vial, as this will help you complete the test more easily. It doesn’t matter how much water is in it, as long as the water doesn’t spill out when the gold is put in, so don’t fill it to the brim. Take careful note of the water level before and after you put in the gold.

3. Put the gold vessel into the measuring jar. Record the change in water level before and after, then calculate the increase in water volume to the milliliter.

4. Calculate the density using the following formula. Gold vessel density = total weight of the gold vessel / volume increase in water. If the density is close to 19 g/ml, it is real gold, or a metal with a density close to gold. Calculate the density according to the formula, and this result will confirm the authenticity on whether it is close to the density of real gold.

Note that the density of gold varies by purity:

14K gold density is equivalent to 12.9 to 14.6 g/ml

Yellow 18K gold has a density equivalent to 15.2 to 15.9 g/mL

White 18K gold density equivalent to 14.7 to 16.9 g/mL

22K gold density equivalent to 17.7 to 17 to 8 g/mL

Method 6: Spectral analysis

In order to strictly test the purity of gold jewelry you also have to find a professional institution to test the sample by X-ray spectral analysis, which can nondestructively analyze the gold and other impurities content in the sample, generally with an accuracy of 99.9%.

Luxury,