How to identify the purity of gold jewelry?

The price of gold jewelry is closely related to the purity of gold. So, what methods can we use to identify the purity of gold jewelry? Xiaobian This will introduce you to the identification method of gold jewelry purity.

Method 1: Look at the color

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

Generally, when the gold content is higher than 95%, it can reflect the rich gold of gold, and it is bright and bright; 90%-95% pure gold, the color will be a little reddish yellow, the brightness is also reduced; 80%-85% purity of gold In light yellow, it will have a feeling of blue and yellow; 65%-70% pure gold, there will be obvious white light in green yellow; 50%-60% pure gold, only light yellow; if 50% purity is not, the whole The whitening is white.

Method 2: Tooth bite method

The bite of gold is actually testing the hardness of gold. This method can filter some gold with low purity. Pure gold is low in hardness and will leave a tooth print if bitten with a tooth. Therefore, when identifying pure gold, you can try its hardness. If the hardness is too high, it cannot be pure gold. (Except for 3D hard gold) This simple and effective method is generally not recommended as it may cause damage to the teeth. In addition, since lead is softer than gold, bit marks will also be left on the gold-plated lead, causing identification errors.

1, first of all to forcefully bite the gold ornaments.

2. See if there are bite marks on the gold ornaments. In theory, the bite marks will be left after the real gold is bitten. The deeper the bite marks, the higher the purity of gold.

Method 3: Listen to the sound

The purity of pure gold and pure gold jewellery is very high, it is very stable, the sound of jewelry falling or colliding with each other will be low and boring, it is the sound of “bar 嗒”, and it will not move when it falls; it has poor color, low purity and even fake gold. When landing or bumping each other, it will make a "dangdang" metal sound, sometimes it will beat the sound, and it will beat after landing. But don't rub it hard and be careful.

Method 4: Fire method

Pure gold is formed by extreme high temperature extraction and cooling. Gold does not change color when it meets fire, but in general, iron ore will turn black when it meets fire. If the fire burns, the gold mixed with more impurities will be burnt black, while the high-purity gold will not change color and still be golden. But don't burn for too long, otherwise the deformation will be bad.

Method 5: Density test

1. Weighing. If you don't have a balance yourself, you can ask a jeweler to help you, usually for free. The weight should be accurate to gram.

2. Fill a vial with water. It is best if there is a millimeter scale on the wall of the vial, which will help you complete the test more conveniently. The amount of water does not matter, as long as the water does not overflow after the gold is put in, so do not pretend to be full. Carefully record the water level before placing the gold and putting the gold.

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

4. Calculate the density using the following formula. Gold density = total weight of gold / volume increased by water. If the density is close to 19 g / ml, it is real gold, or a metal with a density close to gold. The density is calculated according to the formula, and the result is whether or not it is close to the density of the real gold to confirm the true and false.

Note that the density of gold in different purity is also different: 14K gold density is equivalent to 12.9 to 14.6 g / ml; yellow 18K gold density is equivalent to 15.2 to 15.9 g / ml; white 18K gold density is equivalent to 14.7 to 16.9 g / ml; 22K gold density Equivalent to 17.7-17 to 8 g / ml.

Method 6: Spectral Analysis

In order to strictly test the purity of gold jewelry, it is necessary to find a professional organization to test the sample by X-ray spectroscopy, which can analyze the gold and other impurities in the sample without loss, and the general precision can reach 99.9%.

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